Conversation so far:
Where was Darin born?
Born Walden Robert Cassotto in the East Harlem neighborhood of New York City.
When did his name change to Bobby Darin?
Bobby Darin was reared by his maternal grandmother, whom he believed was his mother.
Who was his father?
she refused to reveal the identity of his biological father, and kept the secret to her death in 1983.

Question: What was his childhood like?
Self-contained rewrite: What was Bobby Darin's childhood like?