Conversation so far:
What happened in Brian Wilson's early years and performance?
Brian Wilson grew up in Hawthorne, CA, and had unusually good musical abilities from a young age
Where was Brian Wilson born?
Brian Wilson was born at Centinela Hospital in Inglewood, California
When was Brian Wilson born?
Brian Wilson was born on June 20, 1942

Question: Did he have any siblings?
Self-contained rewrite: Did Brian Wilson have any siblings?