Although mostly its own family, the Brando family contains descendants in Parts V and VI that are considered part of the Joestar family as well, due to Dio Brando taking over Jonathan Joestar's body.
Family tree
Dario Brando--+--Unnamed Woman | | Japanese Woman--+-------Dio Brando w/ Jonathan's body--------------+--Unnamed Woman | | \ | | | \ | Giorno Giovanna | \ Donatello Versus | +--Unnamed Woman +--Unnamed Woman | / | / Rikiel Ungalo Steel Ball Run universe: Dario--+--Mrs. Brando | | Diego Brando Alternate Steel Ball Run Universe : Diego Brando from Another Universe