As the stars of VH1's Brandy & Ray J: A Family Business, the siblings know a thing or two about famous families.

The two tell they're excited for singer Alicia Keys, 29, who confirmed her pregnancy in late May.

Ray J, 29, praises Keys' fiance, Swizz Beatz, 31 -- and then takes a small dig at his big sis!

"Swizz Beatz, you got a fine baby mama!" Ray J says in the video (watch above).

"You did not just say baby mama," Brandy, 31, chastises him. "So that makes me a baby mama, because I'm not married?"

To find out what Brandy thinks of the Glee cast covering her hit "The Boy Is Mine," why Ray J feels like Jesse James and more, watch the video (above).