Stewart Gilligan "Stewie" Griffin, is a
fictional character in the
animated series Family Guy. Stewie is obsessed with
world domination and trying to kill his mother, and has an ambiguous sexual orientation. He is the youngest and the smartest child of
Peter and
Lois Griffin (though, as an infant, he is frequently naïve and misunderstands things). In addition to siblings
Chris and
Meg, Stewie has a half-brother
Bertram who is unknown to the other Griffins.