Conversation so far:
What is the name of Karlheinz Stockhausen's wife ?
Doris Andreae (m. 1951; div. 1965) and Mary Bauermeister (m. 1967; div. 1972)
When was Karlheinz Stockhausen married to Doris Andreae ?
On 29 December 1951, in Hamburg, Karlheinz Stockhausen married Doris Andreae.
How many children did Karlheinz Stockhausen and Doris Andreae have together ?
Together they had four children: Suja (b. 1953), Christel (b. 1956), Markus (b. 1957), and Majella (b. 1961)
Did Karlheinz Stockhausen have any other wives besides Doris Andreae?
Karlheinz Stockhausen married Mary Bauermeister.
When did Karlheinz Stockhausen marry Mary Bauermeister ?
On 3 April 1967, in San Francisco, Karlheinz Stockhausen married Mary Bauermeister.

Question: How many kids did they have together ?
Self-contained rewrite: How many kids did Karlheinz Stockhausen and Mary Bauermeister have together ?