"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."
"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," actress Holly Robinson Peete tweeted after the show.
Cole died on New Year's Eve as a result of heart failure brought on by idiopathic pulmonary arterial hypertension. She was 65.