<P> Peter Griffin (voiced by Seth MacFarlane) is the patriarch of the Griffin household, an Irish - American blue - collar worker . For most of the series, Peter is shown as an obese, unintelligent, lazy, outspoken, immature, and eccentric alcoholic . He has several jobs, which have included working at the Happy Go Lucky Toy Factory, a fisherman, and currently as a shipping clerk at the Pawtucket Brewery . </P> <P> Lois Patrice Griffin (née Pewterschmidt) (voiced by Alex Borstein) is the matriarch of the Griffin household, Peter's wife, and the mother of Meg, Chris, and Stewie . She is an Anglo - American housewife who cares deeply for her kids and her husband, while also working as a piano instructor . Lois is also very flirtatious and has slept with numerous people on the show . </P> <P> Megan "Meg" Griffin (voiced by Lacey Chabert in season 1, Mila Kunis since season 2) is the Griffins' 18 - year - old daughter and oldest child . She is a self - conscious, unattractive, sensitive, and emotionally fragile teenager who is more often than not ridiculed and ignored by the people around her . Meg just wants to be another face in the crowd by fitting in with her peers and being accepted, but she often finds herself to be a victim of circumstance . She has had several love interests over the course of the series, including Brian Griffin, Mayor Adam West, Tom Tucker, Glenn Quagmire, and Joe Swanson . </P> <P> Christopher Cross "Chris" Griffin (voiced by Seth Green) is the Griffins' 15 - year - old son and middle child who, like Meg, is a teenager . He is friendly, idealistic, funny, and good - hearted, as he is one of the few people in Quahog who treats Meg kindly . A recurring gag is that an evil monkey lives in his closet which he finds out is not evil in the episode "Hannah Banana". Physically, he is a younger version of Peter, but intellectually, he more often than not shows better potential, as demonstrated from moments of coherence and articulation within his speech, especially when talking about films, TV series, actors and actresses, etc . </P>

Who is the oldest child on family guy