Rita is a fifty-year-old "cougar" that Brian Griffin dates in "Brian's Got a Brand New Bag" and the former ex fiancée of Brian Griffin.
When Brian shows up for a date with Rita's daughter, named Nicole, he finds that she has already gone out with some other guy and Rita and Brian hit it off. To his family's amusement and dismay, they hit it off and got engaged when Rita break her hip while making love with Brian.
Brian finds out that taking care of an older person can be a burden. Then, he goes on to cheat on Rita, but after feeling much guilt, he later tries to patch things up. But Rita can't forgive him and effectively ending their relationship.
She also still uses old-fashioned words which confuses Brian. Then before leaving, he admits that he can't understand her.
In "Valentine's Day in Quahog", Stewie gathers scores of Brian’s former girlfriends including Rita to get to the bottom of why he’s unsuccessful in love. When Rita says that Brian is 'self-absorbed', Brian lashes back at the criticism, calling Rita an "old bag."