Conversation so far:
Who was somebody important in Kim's life?
Brian Lynch.
Who was Brian Lynch?
American basketball player.
Did she end up marrying Brian?
Clijsters and Lynch married.
What year did they get married?
2007.
Did they have any children?
son.
What was his name?
Jack.
What was something else important to her besides her family?
She is the daughter of Lei Clijsters.

Question: Who is Lei Clijsters?
Self-contained rewrite: Who is Lei Clijsters?