Conversation so far:
How many children did Carl Nielsen have?
Carl Nielsen had five children, two of them illegitimate.
What were Carl Nielsen's five children names?
Carl Nielsen's children were called Carl August Nielsen, Rachel Siegmann, Irmelin Nielsen,  Anne Marie Nielsen and Hans Børge Nielsen.
Who did Carl Nielsen marry?
Carl Nielson married Anne Marie Brodersen.

Question: What year did they get married
Self-contained rewrite: What year did Anne Marie Brodersen and Carl Nielsen get married?