Q: Passage: The first season of the animated comedy series Family Guy aired on Fox from January 31 to May 16, 1999, and consisted of seven episodes. The series follows the dysfunctional Griffin family -- father Peter, mother Lois, daughter Meg, son Chris, son Stewie and their anthropomorphic dog Brian, all of whom reside in their hometown of Quahog. The show features the voices of series creator Seth MacFarlane, Alex Borstein, Seth Green, and Lacey Chabert in the roles of the Griffin family. The executive producers for the first season were David Zuckerman and MacFarlane.

Question: Based on this passage, when did the first family guy episode air?
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This is the relevant information: The first season of the animated comedy series Family Guy aired on Fox from January 31 to May 16, 1999, and consisted of seven episodes. So the answer is The first season of the animated comedy series Family Guy aired on Fox from January 31 to May 16 , 1999.