Conversation so far:
What happened in 2000?
In 2000, Lauper contributed the song "I Want a Mom That Will Last Forever" to the children's movie Rugrats in Paris.
How did that song do?
CANNOTANSWER.
When did she become a mother?
November 19, 1997.
Did she have a boy or girl?
Lauper gave birth to her son Declyn Wallace Thornton.
How did motherhood effect her?
CANNOTANSWER.

Question: What was Sisters of Avalon?
Self-contained rewrite: What was Sisters of Avalon?