<Li> Chris Griffin (brother) </Li> <Li> Brian (family pet, best friend) </Li> <P> Stewart Gilligan "Stewie" Griffin is a main character from the American animated television series Family Guy . Initially obsessed with violence and matricide, Stewie (voiced by Seth MacFarlane) is the youngest child of Peter and Lois Griffin, and the brother of Meg and Chris Griffin . Over the duration of the series, the violent aspects of Stewie's personality have been toned down, and he has evolved into a more eccentric, flamboyant character . He has also come to have a very close friendship with the family's anthropomorphic dog, Brian . Stewie is considered to be the show's breakout character . Wizard magazine rated him the 95th greatest villain of all time . </P> <P> Stewie is a one - year - old prodigy who has a very sophisticated psyche and is able to speak fluently in an upper class English accent . He reaches his first birthday in the season 1 episode "Chitty Chitty Death Bang", and has not been referred to as being more than a year old since, despite being seen in several episodes attending pre-school . Highly literate and able to cite pop culture references that long predate his birth, Stewie is also entranced by Raffi and the Teletubbies . Stewie succumbs to other childish tendencies--he believes Peter has truly disappeared in a game of Peekaboo; talks to his teddy bear, Rupert, as if he were alive; is overcome with laughter when Lois blows on his stomach; and has no idea how to use a toilet . Stewie also has an extreme dislike for Matthew McConaughey . MacFarlane has stated that Stewie is meant to represent the general helplessness of an infant through the eyes of an adult . Per cartoon physics, his ability to move objects of greater weight than himself is not surprising to other characters, nor is his ability to retrieve firearms from hammerspace, neither is his ability to talk . </P>

Who does the voice over for stewie in family guy