Casey Affleck on how Jennifer Garner and kids have inspired Ben to get sober (Exclusive)

Family is everything for the Affleck family -- through the good and the bad. 

During an interview with ET's Keltie Knight at The Old Man and the Gun press day at Viceroy L'Ermitage in Beverly Hills on Saturday, Casey Affleck opened up about his brother, Ben's, recent return to rehab, and how the Justice League star's kids and ex, Jennifer Garner, have inspired him to get sober. 

"Alcoholism has a huge impact on not just the person, but also their family. So, I think for his kids’ sake and for their mom, and for himself, he’s trying to do the work and get it together," Casey explained, noting that he and Ben "come from a long line of alcoholics." 

"Ben is an addict and an alcoholic. Most of my grandparents are alcoholics. My father is an alcoholic, as bad as you can be, and he’s been sober for about 30 years. I’ve been sober for about six years," the 43-year-old actor said. "Ben is trying to put it together, and it can be a very hard thing to do. He has the kind of resources and time, luckily, to take the time and go to a good facility." 

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Casey Affleck out and about
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Casey Affleck out and about
TORONTO, ON - SEPTEMBER 10: Casey Affleck attends the 'The Old Man & The Gun' premiere during 2018 Toronto International Film Festival at The Elgin on September 10, 2018 in Toronto, Canada. (Photo by George Pimentel/source credit)
TORONTO, ON - SEPTEMBER 10: Casey Affleck (L) and Floriana Lima attend the 'The Old Man & The Gun' premiere during 2018 Toronto International Film Festival at The Elgin on September 10, 2018 in Toronto, Canada. (Photo by George Pimentel/source credit)
TELLURIDE, CO - SEPTEMBER 01: Casey Affleck attends the Telluride Film Festival 2018 on September 1, 2018 in Telluride, Colorado. (Photo by Vivien Killilea/Getty Images)
TELLURIDE, CO - AUGUST 31: Casey Affleck attends a screening of 'The Old Man & The Gun' at the Telluride Film Festival 2018 on August 31, 2018 in Telluride, Colorado. (Photo by Vivien Killilea/Getty Images)
LOS ANGELES, CA - JANUARY 06: Casey Affleck (R) and Floriana Lima attend the 7th Annual Sean Penn & Friends HAITI RISING Gala benefiting J/P Haitian Relief Organization on January 6, 2018 in Hollywood, California. (Photo by Kevin Mazur/Getty Images for J/P HRO Gala)
BOSTON, MA - AUGUST 15: Actor Casey Affleck throws out the first pitch before the game between the Boston Red Sox and the St. Louis Cardinals at Fenway Park on August 15, 2017 in Boston, Massachusetts. (Photo by Maddie Meyer/Getty Images)
LOS ANGELES, CA - AUGUST 10: Casey Affleck is seen at LAX on August 10, 2017 in Los Angeles, California. (Photo by starzfly/Bauer-Griffin/GC Images)
LOS ANGELES, CA - JULY 27: Actor Casey Affleck attends the 5th Annual Ping Pong 4 Purpose on July 27, 2017 in Los Angeles, California. (Photo by Allen Berezovsky/WireImage)
US actor Casey Affleck poses for a picture ahead of a press conference on the movie 'A Ghost story' at the 52nd Karlovy Vary International Film Festival (KVIFF) in Karlovy Vary on July 02, 2017. / AFP PHOTO / Michal Cizek (Photo credit should read MICHAL CIZEK/AFP/Getty Images)
JIMMY KIMMEL LIVE - 'Jimmy Kimmel Live' airs every weeknight at 11:35 p.m. EST and features a diverse lineup of guests that includes celebrities, athletes, musical acts, comedians and human-interest subjects, along with comedy bits and a house band. The guests for Tuesday, June 20 included Casey Affleck ('A Ghost Story'), Allison Tolman ('Downward Dog'), comedian Chris Charpentier and Lindsey Ell sitting in with Cleto and the Cletones. (Randy Holmes/ABC via Getty Images) JIMMY KIMMEL, CASEY AFFLECK
SANTA MONICA, CA - FEBRUARY 25: Actor Casey Affleck, winner of the Best Male Lead award for 'Manchester by the Sea' poses in the press room during the 2017 Film Independent Spirit Awards on February 25, 2017 in Santa Monica, California. (Photo by JB Lacroix/WireImage)
HOLLYWOOD, CA - FEBRUARY 26: Actor Casey Affleck poses in the press room at the 89th annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
THE OSCARS(r) - The 89th Oscars(r) broadcasts live on Oscar(r) SUNDAY, FEBRUARY 26, 2017, on the ABC Television Network. (Adam Rose/ABC via Getty Images) CASEY AFFLECK
BEVERLY HILLS, CA - FEBRUARY 26: Floriana Lima and Casey Affleck arrive for the Vanity Fair Oscar Party hosted by Graydon Carter at the Wallis Annenberg Center for the Performing Arts on February 26, 2017 in Beverly Hills, California. (Photo by Karwai Tang/Getty Images)
SANTA MONICA, CA - FEBRUARY 25: Actor / Director Casey Affleck attends the 2017 Film Independent Spirit Awards press room on February 25, 2017 in Santa Monica, California. (Photo by Paul Archuleta/FilmMagic)
LONDON, ENGLAND - FEBRUARY 12: Casey Affleck attends the 70th EE British Academy Film Awards (BAFTA) at Royal Albert Hall on February 12, 2017 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, UNITED KINGDOM - FEBRUARY 12: Casey Affleck seen attending the press room, during the 70th British Academy Film Awards, held at the Royal Albert Hall on February 12, 2017 in London, England. PHOTOGRAPH BY Richard Kendal / Barcroft Images London-T:+44 207 033 1031 E:hello@barcroftmedia.com - New York-T:+1 212 796 2458 E:hello@barcroftusa.com - New Delhi-T:+91 11 4053 2429 E:hello@barcroftindia.com www.barcroftimages.com (Photo credit should read Richard Kendal / Barcroft Images / Barcroft Media via Getty Images)
BEVERLY HILLS, CA - FEBRUARY 06: Casey Affleck arrives at the 89th Annual Academy Awards Nominee Luncheon at The Beverly Hilton Hotel on February 6, 2017 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
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Garner was photographed driving Ben to his rehab facility last month, where he's been recovering for the past few weeks. A source recently told ET that "Jen wants nothing more than for Ben to dedicate himself to his sobriety. She knows she can only do so much, and that the process is up to him." 

Ben has been photographed during his outings from rehab lately, and as Casey noted on Saturday, "It can't be easier to have everybody looking at you and taking your picture as you're walking out of an intervention." "I don’t envy that," he added. "I saw my father struggle with it for many years and nobody was following him around with cameras and stuff. It’s not a great look. But on the other hand, it’s nothing to be ashamed of and it’s good that he’s taken care of."

Casey also gave an update on his brother while chatting with ET at the Toronto International Film Festival earlier this week, as he's been hard at work promoting The Old Man and the Gun.

"I think people seemed to like it in the room, it played very well," he told ET on Saturday of the film's TIFF screening. "Overall, it's been received really well, people especially like Robert Redford... They loved the movie." 

The Old Man and the Gun hits theaters on Sept. 28. 

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Jennifer Garner and kids at her Walk of Fame ceremony
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Jennifer Garner and kids at her Walk of Fame ceremony
Actress Jennifer Garner receives a star on the Hollywood Walk of Fame, August 20, 2018 in Hollywood, California. - Garner, who received the 2,641st star in the Motion Picture category, stars in the soon to be released film 'Peppermint.' (Photo by Robyn Beck / AFP) (Photo credit should read ROBYN BECK/AFP/Getty Images)
HOLLYWOOD, CA - AUGUST 20: Jennifer Garner (second from R) and family attend the ceremony honoring Jennifer Garner with a star on the Hollywood Walk Of Fame on August 20, 2018 in Hollywood, California. (Photo by Steve Granitz/WireImage)
Actress Jennifer Garner poses with members of her family at her star on the Hollywood Walk of Fame, August 20, 2018 in Hollywood, California. From left are parents Patricia Ann Garner and William John Garner, her children Violet Affleck, Seraphina Rose Elizabeth Affleck, Samuel Garner Affleck and her sister Melissa Garner Wylie. - Garner, who received the 2,641st star in the Motion Picture category, stars in the soon to be released film 'Peppermint.' (Photo by Robyn Beck / AFP) (Photo credit should read ROBYN BECK/AFP/Getty Images)
Actress Jennifer Garner receives a star on the Hollywood Walk of Fame, August 20, 2018 in Hollywood, California. - Garner, who received the 2,641st star in the Motion Picture category, stars in the soon to be released film 'Peppermint.' (Photo by Robyn Beck / AFP) (Photo credit should read ROBYN BECK/AFP/Getty Images)
HOLLYWOOD, CA - AUGUST 20: Jennifer Garner and her daughter, Violet Affleck attend the ceremony honoring Jennifer Garner with a Star on The Hollywood Walk of Fame held on August 20, 2018 in Hollywood, California. (Photo by Michael Tran/FilmMagic)
HOLLYWOOD, CA - AUGUST 20: Jennifer Garner (L) and Samuel Garner Affleck attend the ceremony honoring Jennifer Garner with a star on the Hollywood Walk Of Fame on August 20, 2018 in Hollywood, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD, CA - AUGUST 20: Seraphina Rose Elizabeth Affleck (L) and Samuel Garner Affleck attend the ceremony honoring Jennifer Garner with a star on the Hollywood Walk Of Fame on August 20, 2018 in Hollywood, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD, CA - AUGUST 20: (L-R) Susannah Kay Garner Carpenter, Jennifer Garner, and Melissa Garner Wylie attend the ceremony honoring Jennifer Garner with a star on the Hollywood Walk Of Fame on August 20, 2018 in Hollywood, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD, CA - AUGUST 20: Jennifer Garner with her parents and sisters at the ceremony honoring Jennifer Garner with a Star on The Hollywood Walk of Fame held on August 20, 2018 in Hollywood, California. (Photo by Michael Tran/FilmMagic)
Actress Jennifer Garner receives a star on the Hollywood Walk of Fame, August 20, 2018 in Hollywood, California. - Garner, who received the 2,641st star in the Motion Picture category, stars in the soon to be released film 'Peppermint.' (Photo by Robyn Beck / AFP) (Photo credit should read ROBYN BECK/AFP/Getty Images)
HOLLYWOOD, CA - AUGUST 20: A general view of atmosphere at the ceremony honoring Jennifer Garner with a Star on The Hollywood Walk of Fame held on August 20, 2018 in Hollywood, California. (Photo by Michael Tran/FilmMagic)
HOLLYWOOD, CA - AUGUST 20: (L-R) William John Garner, Violet Affleck, Seraphina Rose Elizabeth Affleck, Jennifer Garner, and Samuel Garner Affleck attend the ceremony honoring Jennifer Garner with a star on the Hollywood Walk Of Fame on August 20, 2018 in Hollywood, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD, CA - AUGUST 20: (L-R) Steve Carell, Jennifer Garner, Judy Greer, and Bryan Cranston attend the ceremony honoring Jennifer Garner with a star on the Hollywood Walk Of Fame on August 20, 2018 in Hollywood, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD, CA - AUGUST 20: Jennifer Garner speaks during the ceremony honoring Jennifer Garner with a star on the Hollywood Walk Of Fame on August 20, 2018 in Hollywood, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD, CA - AUGUST 20: Jennifer Garner attends the ceremony honoring Jennifer Garner with a star on the Hollywood Walk Of Fame on August 20, 2018 in Hollywood, California. (Photo by Alberto E. Rodriguez/Getty Images)
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