The brothers Farook: one a decorated veteran, the other a killer

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Who Were San Bernardino Shooters Syed Farook and Tashfeen Malik?


One brother liked to party and chase girls. After high school, moved by what he saw as his patriotic duty, he enlisted in the Navy and received two medals recognizing his contributions to "the global war on terror."

The other was deeply religious and became increasingly intolerant, ultimately nursing a growing hatred that led him, along with his wife, to open fire on a San Bernardino holiday party last week, in what law enforcement officials have termed a terrorist attack.

Syed Raheel Farook and his younger brother Syed Rizwan Farook grew up in the same house, attended the same high school two years apart and, as teenagers, often socialized in the same groups. But as they grew older their paths diverged.

Rizwan is now dead, gunned down by police in Southern California after joining with his wife in killing 14 people and injuring 21. Raheel is alive and left to wonder what went wrong.

See photos of the San Bernardino shooters:

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The brothers Farook: one a decorated veteran, the other a killer
This July 27, 2014 photo provided by U.S. Customs and Border Protection shows Tashfeen Malik, left, and Syed Farook, as they passed through O'Hare International Airport in Chicago. The husband and wife died on Dec. 2, 2015, in a gun battle with authorities several hours after their assault on a gathering of Farook's colleagues in San Bernardino, Calif. (U.S. Customs and Border Protection via AP)
This undated combination of photos provided by the FBI, left, and the California Department of Motor Vehicles shows Tashfeen Malik, left, and Syed Farook. The husband and wife died in a fierce gunbattle with authorities several hours after their commando-style assault on a gathering of Farook's colleagues from San Bernardino, Calif., County's health department Wednesday, Dec. 2, 2015. (FBI, left, and California Department of Motor Vehicles via AP)
An investigator looks at a Black SUV that was involved in a police shootout with suspects, Thursday, Dec. 3, 2015, in San Bernardino, Calif. A heavily armed man and woman opened fire Wednesday on a holiday banquet, killing multiple people and seriously wounding others in a precision assault, authorities said. Hours later, they died in a shootout with police. (AP Photo/Jae C. Hong)
FBI agents search outside a home in connection to the shootings in San Bernardino, Thursday, Dec. 3, 2015, in Redlands, Calif.. A heavily armed man and woman opened fire Wednesday on a holiday banquet, killing multiple people and seriously wounding others in a precision assault, authorities said. Hours later, they died in a shootout with police. (AP Photo/Ringo H.W. Chiu)
Investigators search for bullet casings at the scene where Wednesday's police shootout with suspects took place, Thursday, Dec. 3, 2015, in San Bernardino, Calif. A heavily armed man and woman dressed for battle opened fire on a holiday banquet for his co-workers Wednesday, killing multiple people and seriously wounding others in a precision assault, authorities said. Hours later, they died in a shootout with police.(AP Photo/Jae C. Hong)
Investigators gather around a Black SUV that was involved in Wednesday's police shootout with suspects, Thursday, Dec. 3, 2015, in San Bernardino, Calif. A heavily armed man and woman dressed for battle opened fire on a holiday banquet for his co-workers Wednesday, killing multiple people and seriously wounding others in a precision assault, authorities said. Hours later, they died in a shootout with police. (AP Photo/Jae C. Hong)
REDLANDS, CA - DECEMBER 2: A SWAT team member stands watch with a rifle pointed at a home being investigated by police is shown after a mass shooting at the Inland Regional Center in San Bernardino December 2, 2105 in Redlands, California. Multiple fatalities and injuries were reported in the shooting (Photo by Marcus Yam/Los Angeles Times via Getty Images)
Law enforcement officers investigate a suspicious bag, later found not to be a threat, on Victoria Avenue after a mass shooting at the Inland Regional Center on Wednesday, December 2, 2015 in San Bernardino, California. At least 14 people were killed in a gun attack on a holiday party, triggering a massive manhunt that ended when police shot dead two heavily armed suspects -- a man and a woman -- on a quiet residential street. AFP PHOTO / PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
SAN BERNARDINO, USA - DECEMBER 02: Yellow stripe is seen as the US Security Forces secure the area following a shooting that killed multiple people at a social services center for the disabled in San Bernardino, California of United States on December 02, 2015. Two suspects in a deadly mass shooting that killed 14 victims at a social services facility in California were killed after a confrontation with police, authorities said Wednesday. The initial shooting occurred earlier Wednesday when at least one shooter opened fire in San Bernardino at the Inland Regional Center, which provides services to persons with developmental disabilities and their families. At least 17 others were injured. (Photo by Mintaha Neslihan Eroglu/Anadolu Agency/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: A police officer officer guards a police line as officers prepare to raid the home of one or more suspects of a mass shooting at the Inland Regional Center by multiple gunmen on December 2, 2015 near San Bernardino, California. Police continue to investigate the shooting that left at least 14 people dead and another 17 injured. (Photo by David McNew/Getty Images)
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Authorities surround the scene following a shootout Wednesday, Dec. 2, 2015, in San Bernardino, Calif. Multiple attackers opened fire on a banquet at a social services center for the disabled in San Bernardino on Wednesday, killing multiple people and sending police on a manhunt for suspects. (AP Photo/Jae C. Hong)
Authorities guard the perimeter near the location of an officer-involved shooting Wednesday, Dec. 2, 2015, in San Bernardino, Calif., following a shooting that killed multiple people at a social services center for the disabled. (AP Photo/Damian Dovarganes)
SAN BERNARDINO, CA - DECEMBER 2: Police place a marker along E. San Bernardino Ave. where a shootout occurred December 2, 2015 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for suspects still at large. (Photo by Rick Loomis/Los Angeles Times via Getty Images)
Armed police personnel walk along closed off streets in the San Bernardino neighborhood near the intersection of Richardson and Gould where a house was searched on December 2, 2015. A man and a woman suspected of carrying out a deadly shooting at a center for the disabled in California were killed in a shootout with police, while a third person was detained, police said. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: A police helicopter circles as officers search for a possible suspect following a shootout with suspects of a mass shooting at the Inland Regional Center by multiple gunmen on December 2, 2015 in San Bernardino, California. Police continue to investigate the shooting that left at least 14 people dead and another 17 injured. (Photo by David McNew/Getty Images)
Law enforcement officers search for the suspects of a mass shooting December 2, 2015 in San Bernardino, California. A man and a woman suspected of carrying out a deadly shooting at a center for the disabled were killed in a shootout with police, while a third person was detained, police said. AFP PHOTO / PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
A police officer deploys tape to an area near where authorities stopped a vehicle in San Bernardino, Calif., Wednesday, Dec. 2, 2015. Multiple attackers opened fire on a banquet at a social services center for the disabled in San Bernardino on Wednesday, killing multiple people and sending police on a manhunt for suspects. (AP Photo/Damian Dovarganes)
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(Photo: Inside Edition)
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Law enforcement officers search for the suspects of a mass shooting December 2, 2015 in San Bernardino, California. A man and a woman suspected of carrying out a deadly shooting at a center for the disabled were killed in a shootout with police, while a third person was detained, police said. AFP PHOTO / PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: A SWAT unit mobilizes near Richardson Street after a mass shooting at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at-large. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Law enforcement officers search for a possible suspect following a shootout with suspects of a mass shooting at the Inland Regional Center by multiple gunmen on December 2, 2015 in San Bernardino, California. Numerous deaths and injuries have been reported. (Photo by David McNew/Getty Images)
Law enforcement officers search for the suspects of a mass shooting December 2, 2015 in San Bernardino, California. A man and a woman suspected of carrying out a deadly shooting at a center for the disabled were killed in a shootout with police, while a third person was detained, police said. AFP PHOTO / PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
In this image taken from video, armored vehicles surround an SUV following a shootout in San Bernardino, Calif., Wednesday, Dec. 2, 2015. The scene followed a military-style attack that killed multiple people and wounded others at a California center that serves people with developmental disabilities, authorities said. (KTTV via AP)
SAN BERNARDINA, CA - DECEMBER 2: A search team goes door-to-door looking for the third suspect in a residential neighborhood after a mass shooting at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at-large. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: A California Highway Patrol officer stands with his weapon as authorities pursued the suspects in a shooting that occurred at the Inland Regional Center on December 2, 2015 in San Bernardino, California. Police continue to search for suspects in the shooting that left at least 14 people dead and another 17 injured. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: A California Highway Patrol officer stands with his weapon as authorities pursued the suspects in a shooting that occurred at the Inland Regional Center on December 2, 2015 in San Bernardino, California. Police continue to search for suspects in the shooting that left at least 14 people dead and another 17 injured. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: A San Bernadino Sheriff helicopter flys above a neighborhood as authorities pursue suspects of the shooting at the Inland Regional Center on December 2, 2015 in San Bernardino, California. Police continue to search for suspects in the shooting that left at least 14 people dead and another 17 injured. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Officers swarm San bernardino Ave at Richardson Street near where suspects were shot in a black SUV December 2, 2015 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for suspects still at large. (Photo by Irfan Khan/Los Angeles Times via Getty Images)
Law enforcement officials with armored vehicles search an area near where police stopped a suspect SUV in San Bernardino, Calif., Wednesday, Dec. 2, 2015. The search followed a military-style attack that killed multiple people and wounded others at a California center that serves people with developmental disabilities, authorities said. (AP Photo/Chris Carlson)
Armored vehicles surround an SUV following a shootout in San Bernardino, Calif., Wednesday, Dec. 2, 2015. The scene followed a military-style attack that killed multiple people and wounded others at a California center that serves people with developmental disabilities, authorities said. (KNBC via AP) TV OUT
SAN BERNARDINO, CA - DECEMBER 2: Ambulances leave the scene of a mass shooting at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at-large. (Photo by Gina Ferazzi / Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police draw guns on San Bernardino Avenue while chasing suspects in an SUV December 2, 2015 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for suspects still at large. (Photo by Francine Orr/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police draw guns on San Bernardino Avenue while chasing suspects in an SUV December 2, 2015 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for suspects still at large. (Photo by Francine Orr/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police and emergency vehicles line Waterman Avenue in front of the Inland Regional Center in San Bernardino, scene of a mass shooting on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Luis Sinco/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police and emergency vehicles line Waterman Avenue in front of the Inland Regional Center in San Bernardino, scene of a mass shooting on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Luis Sinco/Los Angeles Times via Getty Images)
Police at the scene of a shooting on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: Members of the FBI Joint Terrorism Task Force stand outside of a press conference regarding the shooting that occurred at the Inland Regional Center on December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: Ambulances pull out of a staging area near the Inland Regional Center where a shooting occurred earlier in the day on December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by Sean M. Haffey/Getty Images)
A heavily armed officer sets up a perimeter near the site of a shooting that took place on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: San Bernardino County Sheriffs deputies respond to a mass shooting at the Inland Regional Center December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by David McNew/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: A San Bernardino County Sheriffs Department investigator responds to a mass shooting at the Inland Regional Center December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by David McNew/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Employees and other people are evacuated by bus from the site of a mass shooting at the Inland Regional Center December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by David McNew/Getty Images)
Police escort civilians away from the 1300 block of S. Waterman Street near the site of a shooting took place on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
Police escort civilians away from the 1300 block of S. Waterman Street near the site of a shooting took place on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
Armed Sheriff's department personel man a roadblock at Waterman Street near the site of a shooting took place on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
A swat team arrives at the scene of a shooting in San Bernardino, Calif. on Wednesday, Dec. 2, 2015. Police responded to reports of an active shooter at a social services facility. (Doug Saunders/Los Angeles News Group via AP) 
SAN BERNARDINO, CA - DECEMBER 2: Police and fire personnel secure the scene where a mass shooting occurred at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Gina Ferazzi / Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: San Bernardino police offices in SWAT gear secure the scene where a mass shooting occurred at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Gina Ferazzi / Los Angeles Times via Getty Images)
A crowd gathers behind police line near the scene of a shooting on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
Photo courtesy: AP
Photo courtesy: AP

A couple embraces following a shooting that killed multiple people at a social services facility, Wednesday, Dec. 2, 2015, in San Bernardino, Calif. (David Bauman/The Press-Enterprise via AP)

People are evacuated by law enforcement agencies from the Inland Regional Center the scene of a shooting in San Bernardino, Calif. on Wednesday, Dec. 2, 2015. Police in San Bernardino, California, were responding to reports of an active shooter at a social services facility. There were reports of multiple victims, Lt. Rich Lawhead said Wednesday. (Doug Saunders/Los Angeles News Group via AP)
A first responder attends to a person outside a Southern California social services center in San Bernardino, where authorities said multiple people were shot Wednesday, Dec. 2, 2015. (KNBC via AP)
People are evacuated by law enforcement agencies from the Inland Regional Center the scene of a shooting in San Bernardino, Calif. on Wednesday, Dec. 2, 2015. Police in San Bernardino, California, were responding to reports of an active shooter at a social services facility. There were reports of multiple victims, Lt. Rich Lawhead said Wednesday. (Doug Saunders/Los Angeles News Group via AP)
First responders attend to people outside a Southern California social services center in San Bernardino, where one or more gunmen opened fire, shooting multiple people on Wednesday, Dec. 2, 2015. (KNBC via AP)

First responders gather outside a Southern California social services center in San Bernardino, Calif., where authorities said multiple people were shot Wednesday, Dec. 2, 2015. (KTTV via AP)

A woman holds her arm as first responders attend to people outside a Southern California social services center in San Bernardino, Calif., where one or more gunmen opened fire, shooting multiple people on Wednesday, Dec. 2, 2015. (KNBC via AP) 
This aerial view shows a Southern California social services center in San Bernardino, Calif., where authorities said multiple people were shot Wednesday, Dec. 2, 2015. (KTTV via AP)
In this aerial view, first responders gather on a nearby street corner, lower left, outside a Southern California social services center, upper right, in San Bernardino, Calif., where authorities said multiple people were shot Wednesday, Dec. 2, 2015. (KTTV via AP)
First responders gather on a nearby street corner as victims are treated outside a Southern California social services center in San Bernardino, Calif., where authorities said multiple people were shot Wednesday, Dec. 2, 2015. (KTTV via AP)
Law enforcement officials walk with weapons drawn outside a Southern California social services center in San Bernardino, Calif., where authorities said multiple people were shot Wednesday, Dec. 2, 2015. (KTTV via AP)
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The contrasting lives of the Farook brothers, described by friends, neighbors and former classmates who knew them both, is a disturbing tale, in part because there are so few clues to why they turned out so differently.

The family, including Raheel, declined repeated requests through their lawyers for comment for this story. But those who knew the brothers say that by high school, their differences were apparent and growing.

"Most people here go to mosque to please their parents," said Shakib Ahmed, who attended mosque with the Farooks.

Raheel, the older brother, was that kind of kid, he said. He went to Friday prayers, but he also liked to drink and had a girlfriend in high school who wasn't Muslim.

Rizwan was quieter and more serious - and far more religious. Only with his older brother, friends said, did they see Rizwan lose his temper.

"He was nice to everyone else, but he was kind of the dominating type. He would yell at his brother," Ahmed said.

PHYSICAL DISTANCE

Soon after graduating from high school in 2003, with the U.S. invasion of Iraq just months old, Raheel joined up and went off to boot camp in Illinois, according to naval records. In 2004, he was assigned to serve on the USS Enterprise as an information system technician.

Back home, Rizwan, a bright boy, finished high school a year early according to school records. In the years that followed, friends and neighbors say, he quit wearing jeans and polo shirts and donned robes.

"I noticed a change with the clothes and the beard," said Ahmed.

At home, there was increasing turmoil. In 2006, the boys mother, Rafia Farook, filed for divorce from her husband Syed after more than 24 years of marriage, according to court documents.

In court filings, Rafia cited multiple instances of domestic abuse, asserting that her husband was "mentally ill" and threatened "to kill himself on a daily basis." During one violent incident, she said, her son came between them "to save me."

Gasser Shehata, a friend of Rizwan's from a San Bernardino mosque, said that Rizwan talked to him in recent years about his religious issues with his dad while growing up, and how he came to side with his mother in their disputes. Shehata said that Rizwan told him that his father refused to pray regularly, which was a source of tension.

When Rizwan joined the dating site bestmuslim.com in 2013, his profile described how he spent much of his free time "memorizing the Qur'an and learning more about the religion."

He was looking, he wrote, for a woman "who takes her religion very seriously and is always trying to improve her religion and encouraging others to do the same."

Even as the distance between the brothers grew, they remained bonded.

PHOTOS: Inside the San Bernardino couple's home

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Inside San Bernardino shooting suspects home
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The brothers Farook: one a decorated veteran, the other a killer
REDLANDS, CA - DECEMBER 4: Inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly the recent mass shootings, lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A Quran sits in the living room inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: An identification card for Syed Farook inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A hole in the ceiling could be seen inside the closet area of the rear bedroom inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A baby crib is seen inside the baby room of the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings, lived, on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A firearm lubricant could be seen in the closet of the front bedroom inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: Media reporters go in and out of the townhouse where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A praying mat and a cleared out closet in the baby room in the front of the apartment. A rare first glimpse inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly the recent mass shootings, lived, on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: Prayer beads are seen laying on the bed alongside personal documents in the rear bedroom inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A closet inside the baby room. A rare first glimpse inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings, lived, on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A rare first glimpse inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings, lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
A book sits on a table inside the home of San Bernardino mass murder suspect Syed Farook, December 4, 2015 in Redlands, California. The community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. AFP PHOTO / ROBYN BECK / AFP / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
Journalists squeeze into a child's bedroom in the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. AFP PHOTO / ROBYN BECK / AFP / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
A view of the kitchen inside the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. AFP PHOTO / ROBYN BECK / AFP / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
A television crew prepares to do a live report inside a child's bedroom in the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. AFP PHOTO / ROBYN BECK / AFP / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 04: Reporters take pictures of photographs found inside the home of shooting suspect Syed Farook on December 4, 2015 in San Bernardino, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: Baby food sits on a kitchen counter inside the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: A hatchet sits in a kitchen drawer inside the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: Reporters inspect the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: Arabic books sit in a closet inside the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: An Islamic Manners book sits in a bedroom inside the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: A book about prayer sits on a bedside table inside the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
SAN BERNARDINO, CA - DECEMBER 04: Reporters inspect the home of shooting suspect Syed Farook on December 4, 2015 in San Bernardino, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: Reporters inspect the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: Reporters inspect the home of Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
Members of the media crowd into the apartment bedroom of San Bernardino shooting suspects Syed Farook and his wife, Tashfeen Malik, in Redlands, Calif., Friday, Dec. 4, 2015, after the building landlord invited journalists into the townhouse. A book containing passages from the Quran is seen at right. (AP Photo/Chris Carlson)
Members of the media crowd into a child's room in an apartment in Redlands, Calif., shared by San Bernardino shooting rampage suspects Syed Farook and his wife, Tashfeen Malik, Friday, Dec. 4, 2015, after the building landlord invited media into the townhouse rented by the California attackers. (AP Photo/Chris Carlson)
Members of the media crowd into the living room of an apartment in Redlands, Calif., shared by San Bernardino shooting rampage suspects Syed Farook and his wife, Tashfeen Malik, Friday, Dec. 4, 2015, after the building landlord invited media into the townhouse rented by the California attackers. (AP Photo/Chris Carlson)
Members of the media crowd into the living room of an apartment in Redlands, Calif., shared by San Bernardino shooting rampage suspects Syed Farook and his wife, Tashfeen Malik, Friday, Dec. 4, 2015, after the building landlord invited media into the townhouse rented by the California attackers. (AP Photo/Chris Carlson)
Members of the media crowd into a child's room in an apartment in Redlands, Calif., shared by San Bernardino shooting rampage suspects Syed Farook and his wife, Tashfeen Malik, Friday, Dec. 4, 2015, after the building landlord invited media into the townhouse rented by the California attackers. (AP Photo/Chris Carlson)
A member of the media films a wall tapestry displaying religous writing in the living room of an apartment in Redlands, Calif., shared by San Bernardino shooting rampage suspects Syed Farook and his wife, Tashfeen Malik, Friday, Dec. 4, 2015, after the building landlord invited media into the townhouse rented by the California attackers. (AP Photo/Chris Carlson)
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Attendees at Rizwan's wedding reception last year at the Islamic Center of Riverside said Rizwan seemed to enjoy his brother's easy and relaxed manner with the guests, even though he said little and seemed withdrawn. At one point, Raheel even teased his younger brother, calling him "Rizi," which Rizwan took in good humor.

Some of those who knew the Farooks have thought deeply about the brothers and their differences in recent days. But many of the things they come up with could apply to any siblings.

"Raheel was just a normal ... guy," said Usmaan Arshad, who attended La Sierra High School with the brothers. "No one talked to Rizwan," he said.

Rose Aguirre, a neighbor of the family for years, said the difference between the Farook sons had seemed to her to boil down to the fact that Raheel was "more personable, more Americanized" than his brother.

But those characterizations worked only before last week, when it became apparent that the differences went far deeper.

Attorney David Chesley told CNN on Monday that Raheel "is very upset with his brother."

"He's totally depressed and broken with grief."

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