Thelma Griffin

Family Guy is an American animated comedy series created by Seth MacFarlane for the Fox Broadcasting Company. Characters are listed only once, normally under the first applicable subsection in the list; very minor characters are listed with a more regular character with whom they are associated.

Peter Griffin (voiced by Seth MacFarlane) is the patriarch of the Griffin household, an Irish-American blue-collar worker. He is a lazy, immature, obese, laid-back, dim-witted, outspoken, eccentric alcoholic. Peter's jobs have included working at the Happy Go Lucky Toy Factory, working as a fisherman, and currently working at Pawtucket Brewery.

Lois Patrice Griffin (née Pewterschmidt) (voiced by Alex Borstein) is Peter's wife and the mother of Meg, Chris, and Stewie. She is a Scots/Anglo American housewife who cares for her kids and her husband, while also teaching children to play the piano. She is also very flirtatious and has slept with numerous people on the show.

Megatron "Meg" Griffin (voiced by Lacey Chabert in season 1, Mila Kunis from season 2-present) is the Griffins' 18-year-old child and only daughter. She is a self-conscious, unattractive teenage girl with severely low self-esteem, being portrayed as generally soft and non-rebellious. Meg has had several love interests including Brian Griffin, Mayor West, Tom Tucker, Quagmire, and Joe Swanson.

Christopher Cross "Chris" Griffin (voiced by Seth Green) is Peter and Lois' 14-year-old child. He is obese, irresponsible, and emotionally effusive. A recurring gag is that an evil monkey lives in his closet which he finds out is not evil in the episode "Hannah Banana". He tries fitting in with his peers, but fails due to his social awkwardness.

...
Wikipedia