George Balanchine's father Meliton and brother Andria both were composers:
I wonder if it is possible to find some recordings of their music ?
Here's an article about the Balanchivadze family:
http://www.opentext.org.ge/art/BALANCH.HTMThere were many theater and cinema people in Agnes De Mille's family: her famous uncle the film director Cecil B. De Mille, but also her father William Churchill De Mille (playwright and film director), her grandfather Henry Churchill De Mille (playwright), her grandmother
Beatrice DeMille born Matilda Beatrice Samuel (playwright); also her maternal grandfather was the economist Henry George.
http://www.imdb.com/name/nm0210352/http://www.imdb.com/name/nm0218486/Maurice Béjart's father was the philosopher Gaston Berger (1896-1960), here are
some biographies of him (in French, I couldn't find one in English):
http://www2.ac-lille.fr/gberger/FLycee/l2_vieGB.htmRoland Petit's mother, Rose Repetto, created the shoe company Repetto in 1947 (at first to help his son).
François Guizerix, the brother of the former POB principal Jean Guizerix, is known as a puppeteer and also acted in a few movies:
http://www.imdb.com/name/nm0347621/