EXCLUSIVE: Natalie Cole's family outraged over GRAMMYs' 'disrespectful' tribute to late singer

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Natalie Cole was remembered at the GRAMMYs during the In Memoriam segment, but her family -- and her fans -- are up in arms over the fact that the late singer was passed over for a special tribute.

"Sadly a FORGETTABLE tribute to Natalie Cole," Cole's sisters, Timolin and Casey, told ET following the GRAMMY telecast. "Words cannot express the outrage and utter disappointment at the disrespectful tribute, or lack thereof, to a legendary artist such as our sister."

"Here is a woman who has been in the business for four decades, had 21 GRAMMY nominations and won nine GRAMMYs. She deserves more than (to be a part of) a minute-and-a-half tribute," Cole's son Robert Adam Yancy told ET on Monday night. "It was shameless the way they minimized her legacy. We will find solace in her legacy as well as her endless fans around the world."

Natalie Cole through the years:

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EXCLUSIVE: Natalie Cole's family outraged over GRAMMYs' 'disrespectful' tribute to late singer
06/30/2005.gala.Natalie Cole performs one of threee songs at the gala. A black tie Inagural Gala was held this evening at the Dorothy chandler Pavilion in Los Angeles for Mayor elect Antonio Villaraigosa, who will be sworn in tomorrow. Dinner and dancing was held by the fountain outdoors in the huge fundraising affair. (Photo by Anne Cusack/Los Angeles Times via Getty Images)
ATLANTA, GA - JUNE 26: Recording Artist Natalie Cole performs atJazz 91.9 WCLK 41st Anniversary Benefit Concert at Cobb Energy Performing Arts Center on June 26, 2015 in Atlanta, Georgia. (Photo by Moses Robinson/Getty Images)
ATLANTA, GA - JUNE 26: Recording Artist Natalie Cole performs atJazz 91.9 WCLK 41st Anniversary Benefit Concert at Cobb Energy Performing Arts Center on June 26, 2015 in Atlanta, Georgia. (Photo by Moses Robinson/Getty Images)
BRENTWOOD, CA - JUNE 11: Recording artist Natalie Cole performs onstage during City Of Hope's 11th Annual 'Songs Of Hope' Event on June 11, 2015 in Brentwood, California. (Photo by Lester Cohen/Getty Images for City of Hope)
LOS ANGELES, CA - FEBRUARY 22: Singer Natalie Cole attends Mercedes-Benz USA and African American Film Critics Association Academy Awards viewing party on February 22, 2015 in Los Angeles, California. (Photo by Chelsea Lauren/Getty Images for Mercedes-Benz USA)
NEW YORK, NY - OCTOBER 20: Natalie Cole attends Angel Ball 2014 hosted by Gabrielle's Angel Foundation at Cipriani Wall Street on October 20, 2014 in New York City. (Photo by Jamie McCarthy/Getty Images for Gabrielle's Angel Foundation)
BEVERLY HILLS, CA - OCTOBER 11: Recording artists Johnny Mathis (L) and Natalie Cole attend the 2014 Carousel of Hope Ball presented by Mercedes-Benz at The Beverly Hilton Hotel on October 11, 2014 in Beverly Hills, California. (Photo by Kevin Winter/Getty Images)
BERLIN, GERMANY - JULY 16: American singer Natalie Cole performs live during a concert at the Admiralspalast on July 16, 2014 in Berlin, Germany. (Photo by Frank Hoensch/Redferns via Getty Images)
CIRCA 1955: Singer Nat 'King' Cole and his daughter Natalie Cole pose for a portrait session in front of a Christmas tree in circa 1955. (Photo by Michael Ochs Archives/Getty Images)
CIRCA 1955: Singer Nat 'King' Cole and his daughter Natalie Cole pose for a portrait session in front of a Christmas tree in circa 1955. (Photo by Michael Ochs Archives/Getty Images)
CANADA - CIRCA 1900: Natalie Cole (Photo by Toronto Star Archives/Toronto Star via Getty Images)
UNSPECIFIED - CIRCA 1970: Photo of Natalie Cole Photo by Michael Ochs Archives/Getty Images
UNSPECIFIED - CIRCA 1970: Photo of Natalie Cole Photo by Michael Ochs Archives/Getty Images
UNSPECIFIED - CIRCA 1970: Photo of Natalie Cole Photo by Michael Ochs Archives/Getty Images
Publicity shots of the singer Natalie Cole, 1992. (Photo by Afro American Newspapers/Gado/Getty Images)
American singer Natalie Cole, 1975. Daughter of Nat King Cole. (Photo by Afro American Newspapers/Gado/Getty Images)
UNSPECIFIED - CIRCA 1970: Photo of Natalie Cole Photo by Michael Ochs Archives/Getty Images
UNSPECIFIED - CIRCA 1970: Photo of Natalie Cole Photo by Michael Ochs Archives/Getty Images
UNSPECIFIED - CIRCA 1970: Photo of Natalie Cole Photo by Michael Ochs Archives/Getty Images
HOLLYWOOD - FEBRUARY 19: Singer Natalie Cole and guests attending 19th Annual Grammy Awards on February 19, 1977 at Hollywood Palladium in Hollywood, California. (Photo by Ron Galella/WireImage)
1978 AMERICAN MUSIC AWARDS - Gallery - Shoot Date: November 18, 1977. (Photo by ABC Photo Archives/ABC via Getty Images) HOSTS DAVID SOUL AND NATALIE COLE
NEW YORK CITY - AUGUST 5: Singer Natalie Cole autographing new album 'Unforgettable With Love' on August 5, 1992 at Sam Goody's in New York City, New York. (Photo by Ron Galella, Ltd./WireImage)
NEW YORK CITY - AUGUST 5: Singer Natalie Cole autographing new album 'Unforgettable With Love' on August 5, 1992 at Sam Goody's in New York City, New York. (Photo by Ron Galella, Ltd./WireImage)
NEW YORK, NY Â FEB 25: Natalie Cole attends the 34th Annual Grammy Awards at Radio City Music Hall on Feb 25, 1992 in New York City. (Photo by Robin Platzer/Images/Getty Images)
(GERMANY OUT) e, Natalie *06.02.1950-Saengerin, USA- Konzert in der Philharmonie in Berlin- Mai 1992 (Photo by POP-EYE/ullstein bild via Getty Images)
Natalie Cole performs on stage at RAI Congrescentrum, Amsterdam, Netherlands, 10th May 1992. (Photo by Rob Verhorst/Redferns)
Portrait of singer Natalie Cole, 1993. (Photo by Afro American Newspapers/Gado/Getty Images)
Singer/songwriter Natalie Cole, right, walks off stage after receiving "The Hitmaker's Award" from legendary vocalist Tony Bennett, at the Songwriter's Hall of Fame Wednesday, June 9, 1999, in New York. Cole is the daughter of the late vocalist Nat King Cole. (AP Photo/Stuart Ramson)
Natalie Cole's Grammy-winning compact disk, "Unforgettable," in its jewel box, right, is dwarfed by the "long box" packaging that it is currently available in at a New York music store, Thursday, February 27, 1992. The Recording Industry Association of America announced Thursday that it would adopt a new packaging standard that would eliminate the long box by April 1993 and instead make use of only the 5"x 5 1/2" jewel box. (AP Photo/Mark Phillips)
Ray Charles talks about Nat King Cole as Cole's daughter Natalie looks on backstage the 15th Annual Rock and Roll Hall of Fame Induction Dinner Monday, March 6, 2000, at New York's Waldorf-Astoria. Ray Charles presented Nat King Cole's award to his three daughters. (AP Photo/Ed Betz)
Natalie Cole performs in a '70s afro wig during the "13th Annual Race to Erase M.S." fashion show/concert at the Century Plaza Hotel in Los Angeles, Friday, May 12, 2006. The charity event was themed "Disco Fever to Erase M.S." (AP Photo/Chris Pizzello)
Natalie Cole sings for Los Angeles Mayor-elect Antonio Villaraigosa during his inaugural gala in Los Angeles on Thursday, June 30, 2005. Villaraigosa is to be sworn in on Friday. (AP Photo/Chris Carlson)
Tony Bennett, right, greets Natalie Cole with a kiss before they sang a duet with at a 106.7 Lite fm ?One Night With Lite? Concert at The Theater at Madison Square Garden, Tuesday, Sept. 26, 2006 in New York. (AP Photo/Henny Ray Abrams)
U.S. jazz singer Natalie Cole performs during her concert at the Torwar arena in Warsaw, Poland, Monday, July 16, 2007. The concert was a part of the Warsaw Summer Jazz Days festival. (AP Photo/Alik Keplicz)
Natalie Cole arrives for the 49th Annual Grammy Awards on Sunday, Feb. 11, 2007, in Los Angeles. (AP Photo/Matt Sayles)
Singer Natalie Cole attends the 2007 G&P Foundation 10th Annual Angel Ball at the Marriott Marquis, Moday, Oct. 29, 2007 in New York. (AP Photo/Evan Agostini)
Natalie Cole, who was recently treated for Hepatitis C, holds up a greeting card from actor/comedian George Lopez during a signing session for her new CD, "Still Unforgettable," at Borders Westwood in Los Angeles., Tuesday, Oct. 28, 2008. (AP Photo/Chris Pizzello)
Natalie Cole holds the best instrumental arrangement accompanying vocalist award backstage at the 51st Annual Grammy Awards on Sunday, Feb. 8, 2009, in Los Angeles.(AP Photo/Matt Sayles)
Singer Natalie Cole performs at the LA Live entertainment complex holiday tree lighting ceremony in Los Angeles on Thursday, Dec. 4, 2008. (AP Photo/Dan Steinberg)
075207.CA.1220.baltin.cc Natalie Cole, was one of the maney articts performing at the Stevie Wonder's Eighth Annual House Full of Toys Benefite Concert held at The Forum Saturday night. (Photo by Carlos Chavez/Los Angeles Times via Getty Images)
American singer, and songwriter, Natalie Cole, 23rd October 1975. (Photo by Michael Putland/Getty Images)
1978 AMERICAN MUSIC AWARDS - Broadcast Coverage - Airdate: January 16, 1978. (Photo by ABC Photo Archives/ABC via Getty Images) HOST NATALIE COLE
(GERMANY OUT) e, Natalie *06.02.1950-Saengerin, USA- Konzert in der Philharmonie in Berlin- Mai 1992 (Photo by POP-EYE/ullstein bild via Getty Images)
Natalie Maria Cole, an African-American singer, songwriter, and performer, and the daughter of Nat King Cole, on television with another person, mid to late twentieth century. (Photo by Afro American Newspapers/Gado/Getty Images)
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READ MORE: Family and Friends Gather to Celebrate Natalie Cole's Life

David Bowie, Lionel Richie, B.B. King and The Eagles' Glenn Frey were all celebrated with their own musical tributes during the awards ceremony.

The legendary singer, daughter of Nat King Cole, won nine GRAMMYs in her lifetime and was behind R&B classics such as "Unforgettable" and "This Will Be." Cole died at the age of 65 in Los Angeles on Dec. 31, 2015 due to idiopathic pulmonary arterial hypertension.

Celebrities were unhappy over Cole's tribute snub, taking to social media to voice their disappointment.

"We lost so many greats but Natalie Cole 1st African American to win Best New Artist deserved a tribute #Gmmys #BHM," Holly Robinson Peete wrote on Twitter.

RELATED: Dionne Warwick, Cher, Questlove and More Share Touching Tributes to Natalie Cole

Empire co-creator Lee Daniels took to Instagram to voice his disdain, captioning a black-and-white photo of Cole, "Disappointed in Grammys... Come y'all ... She deserved a better tribute #9grammyswon really???... R.I.P."

Cole's lack of a GRAMMY tribute had been the topic of debate even before Monday's telecast. Eric Benet shared a video on Saturday questioning the GRAMMYs' decision not to honor Cole's legacy.

"Didn't even talk about Natalie, such a powerhouse of pop, jazz, soul, GRAMMY artist and no tribute to Natalie Cole. So GRAMMYs, shame on you, shame on you, shame on you," Benet said.

Meanwhile, fans took to Twitter to voice their disappointment that the GRAMMYs failed to recognize one of their own.

READ MORE: Natalie Cole's Sisters Open Up About Their Final Days With the Late Singer

READ MORE: The Best, Worst and Weirdest Moments at GRAMMYs 2016

In January, Cole's sisters sat down with ET and opened up about their last days with the legendary singer.

"When we came to the hospital and spent Christmas Eve with her it was a godsend," Timolin said at the time. "We were very blessed and thankful to spend that very special day with her that she loved. It was her favorite time of year."

Former ET host Mary Hart helped remember Cole by reflecting on the time she spent with her in 2008, when Cole was still in need of a new kidney.

"I'm a survivor," Natalie said back then. "I don't know where I really got it from, but I just don't believe in giving up until the fat lady sings, and the fat lady hasn't sung yet."

EXCLUSIVE: Natalie Cole's Sisters Reveal Why She Kept Her Illness a Secret
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