Conversation so far:
Who were Laurence Olivier's parents?
Laurence Olivier was born the youngest of the three children of the Reverend Gerard Kerr Olivier and his wife Agnes Louise.
Where did Laurence Olivier grow up?
For Laurence Oliver's first few years, he never lived in one place long enough to make friends.

Question: Did he have any siblings?
Self-contained rewrite: Did Laurence Olivier have any siblings?