Natalie Cole's Family and Fans Upset by 'Forgettable' Grammys Tribute to Late Singer

The late singer was not given a musical tribute at Monday night's show.

"Sadly a FORGETTABLE tribute to Natalie Cole," Cole's sisters, Timolin and Casey, told Entertainment Tonight after the awards show, which they attended. "Words cannot express the outrage and utter disappointment at the disrespectful tribute, or lack thereof, to a legendary artist such as our sister."

Cole died on New Year's Eve as a result of heart failure brought on by idiopathic pulmonary arterial hypertension. She was 65.

Timolin and Casey Cole on their way to the #GRAMMYs #NKCGH #NatalieCole #NatKingCole #Unforgettable #KeepMusicAlive pic.twitter.com/LFUlLP97QL

— NatKingColeHope (@NatKingColeHope) February 15, 2016

"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 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."

The Recording Academy, which sponsors the Grammys, did not immediately respond to ABC News' request for comment.

Meanwhile, Cole's fans took to Twitter to voice their disappointment.

We lost so many greats but Natalie Cole 1st African American to win Best New Artist deserved a tribute #Grammys #BHM pic.twitter.com/tKMbrUtBkL

Cole died on New Year's Eve as a result of heart failure brought on by idiopathic pulmonary arterial hypertension. She was 65.

Cole died on New Year's Eve as a result of heart failure brought on by idiopathic pulmonary arterial hypertension. She was 65.