Well, the family was Andy and the Bey Sisters - Geraldine and Salome, that is.
You can hear them together on their two early Prestige LPs collected on the CD pictured below.
Don't know about the bassist, but Chief Bey was a percussionist born in the US, although he told he was born in Dakar, Senegal, and well versed in African drums - he was a member of Olatunji's first troupe. He did not too long ago, IIRC. Do a search. I don't think he was related to the singer.