Conversation so far:
Did Jascha Heifetz have siblings?
CANNOTANSWER.
what were his parents like?
Jascha had become the family's sole breadwinner, would still roundly criticise every performance.
was he married?
Heifetz married silent motion picture actress Florence Vidor (1895-1977).
did they have children?
The couple had two more children.
did they stay married?
divorcing in 1945.
did he remarry?
In 1947, Heifetz married Frances Spielberger Spiegelberg (1911-2000), with whom he had another son, Joseph (known as Jay).
The second marriage ended in divorce in 1962.
Did he have any other family?
Heifetz's son Jay is a professional photographer.

Question: was his other children famous?
Self-contained rewrite: Besides Jay, was Hefeitz's other children famous?