Natalie Cole’s family is not happy with the 58th Grammy Awards’ tribute to the late singer-songwriter.

The awards show paid homage to Cole, who died of congestive heart failure on Dec. 31, 2015, with a video clip of the R&B singer performing a virtual duet of “Unforgettable” with her father, renowned jazz pianist Nat King Cole.

As David Bowie, B.B. King, Lemmy Kilmister and Glenn Frey, who all died in 2015, were celebrated with honorary musical performances during the awards ceremony, Cole’s family members considered the brief video tribute insufficient.

“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 ET.

Added Cole’s son Robert Adam Yancy: “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. 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.”

Cole was known for hits including “This Will Be,” “I Live for Your Love” and “Unforgettable.” She also dabbled in acting in her later years, landing guest appearances on TV series including “Touched by an Angel,” “I’ll Fly Away,” “Grey’s Anatomy” and “Law & Order: SVU.”

Fans as well as other artists and entertainment figures including Toni Braxton, Holly Robinson Peete and Lee Daniels also took note of Cole’s brief Grammys tribute, resorting to social media to voice their disappointment: