By Jeff Nelson
Updated February 17, 2016 02:00 PM

From David Bowie to B.B. King, Monday night’s Grammys show was full of musical tributes to legends – but one was missing.

While Natalie Cole – who died on New Year’s Eve – was honored with a video clip showing her performing a virtual duet with her late father Nat King Cole, a special musical tribute was not arranged to commemorate the singer’s contributions to the recording industry.

First fans took to Twitter to express their frustration – and now her family has opened up about their frustration with the Recording Academy’s 58th annual show.

“Words cannot express the outrage and utter disappointment at the disrespectful tribute, or lack thereof, to a legendary artist such as our sister,” Cole’s sisters, Timolin and Casey, told Entertainment Tonight.

Over the course of her 40 years in music, Cole garnered 21 Grammy nominations, earning nine in total, including becoming the first African American best new artist.

“She deserves more than [to be a part of] a minute-and-a-half tribute,” Cole’s son Robert Adam Yancy told ET. “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 “Unforgettable” singer was 65 when she died of heart failure in Los Angeles.