Conversation so far:
When did Pamela Harriman marry Randolph Churchill?
Pamela Harriman married Randolph Churchill in 1939.
Did Pamela Harriman and Randolph Churchill have children?
Pamela Harriman and Randolph Churchill had one child: Winston Churchill.

Question: How did they meet?
Self-contained rewrite: How did Pamela Harriman and Randolph Churchill meet?