Conversation so far:
How was Lisa Simpson developed?
Matt Groening, in the lobby of producer James L. Brooks's office, hurriedly sketched his version of a dysfunctional family and Lisa Simpson was named after Groening's younger sister.
What is Lisa Simpson's IQ?
Lisa Simpson is said to have an IQ of 159.
Who is Lisa Simpson?
Lisa Marie Simpson is a fictional character in the animated television series The Simpsons.
Who created Lisa Simpson?
Matt Groening conceived Lisa Simpson.

Question: Who's lisa's dad?
Self-contained rewrite: Who's Lisa Simpson's dad?