Who is Bae-Bae Wilson from Sister, Sister and what is their importance?

Bae-Bae Wilson is Chiquita's mother. She lives in Memphis with her husband. When Chiquita finally visits her, Bae-Bae tells her how she got pregnant at seventeen years old and allowed her parents to raise Chiquita because she could not provide for her. Bae-Bae says that Chiquita is the only thing she has ever done that turned out right.