Conversation so far:
When was Walter Hagen born?
Walter Hagen was born December 21, 1892.
Where was Walter Hagen born?
Walter Hagen was born in Rochester, New York.
Who were Walter Hagen's parents?
Walter Hagen's parents were William and Louisa (Boelke) Hagen, his father worked as a millwright and blacksmith in Rochester's railroad-car shops.

Question: did he have any siblings?
Self-contained rewrite: Did Walter Hagen have any siblings?