Conversation so far:
Who did Harriet Tubman marry?
Harriet Tubman married a free black man named John Tubman.
When did Harriet Tubman and John Tubman marry?
Around 1844, Harriet Tubman married a free black man named John Tubman.

Question: Did they have any kids?
Self-contained rewrite: Did Harriet Tubman and John Tubman have any kids?