Who played robert sister in the five heartbeats who sang song with him?

The character of Robert's sister in the movie "The Five Heartbeats" was named Sheila, and she was played by actress Sonia Braga. In the movie, Sheila was a talented singer who performed with Robert's band, The Five Heartbeats. She was featured in several musical numbers throughout the film, including a memorable duet with Robert called "Nights Over Egypt." Sonia Braga's performance in "The Five Heartbeats" was praised for its emotional depth and powerful vocal abilities.