Susanna “Susie” Swanson is the daughter of Joe Swanson and Bonnie Swanson and younger sister of Kevin Swanson and the love interest of Stewie Griffin. She was born in "Ocean's Three and a Half".
Stewie Griffin falls madly in love with her. He even sings her Bryan Adams's "(Everything I Do) I Do It For You". She beats up Stewie with a Barbie doll in the episode "Stew-Roids", and as a result Peter Griffin calls her a lesbian.
It is unknown who took care of her while her parents were guests at James Woods's mansion in "And Then There Were Fewer", as she was not brought with them.
In "Road to the North Pole", she is seen in her highchair at the dinner table on Christmas Eve when her parents explain their Christmas wishes during "All I Really Want For Christmas". Her mother is holding her during Brian Griffin's plea on Quahog 5 News on Christmas morning.
In the 10 years before her birth the only time she ever made a movement inside Bonnie's uterus was when she kicked Peter in "Lethal Weapons".
She never met her older brother, Kevin Swanson, who was reported as MIA while serving in Iraq before Susie was born until "Thanksgiving".
Susie turns 1 in "He's Bla-ack!" as Peter and Cleveland have to deal with their wives feuding.
Patrick Stewart gives voice to Susie's inner monologues in "The Hand That Rocks the Wheelchair", "Thanksgiving", "Internal Affairs", and in "Joe's Revenge".