Conversation so far:
Where was Bobby Darin born?
Bobby Darin was born in the East Harlem neighborhood of New York City.
When did Bobby Darin's name change from Walden Robert Cassotto to Bobby Darin?
Robert Cassotto became Bobby Darin thanks to a take out restaurant sign; the letters M, A and N on the light-up sign MANDARIN were not working, leaving only DARIN.
Who was Bobby Darin's father?
Darin's birth mother, Nina refused to reveal the identity of his biological father, and kept that secret to her death in 1983.

Question: What was his childhood like?
Self-contained rewrite: what was Bobby Darin's Childood like growing up in in the East Harlem neighborhood of New York City. ?