One of four siblings (along with Eva, Paul, and Alina) born to piano virtuoso Arthur Rubinstein (
Artur Rubinstein) and his wife, Nela (born Aniela Mlynarska), John Rubinstein has one daughter (Jessica Katz,
Michael Weston, and four sons -- Michael (professional name: Michael Weston), Peter Rubinstein, Jacob Rubinstein, and Max Burgess-Rubinstein), and four grandchildren.