Conversation so far:
Where was Walter O'Malley born?
Walter O'Malley was born in the Bronx, New York
Who was Walter O'Malley father?
Walter O'Malley's father was Edwin Joseph O'Malley
What did Walter O'Malley father do?
Walter O'Malley's father was a cotton goods salesman
Who was Walter O'Malley mother?
Walter O'Malley's mother was Alma Feltner
What did Walter O'Malley mother do?

Question: How did he get interested in baseball?
Self-contained rewrite: How did Walter O'Malley get interested in baseball?