Marguerite Pewterschmidt was an extremely wealthy aristocrat from Newport, Rhode Island. She was the great-aunt of Lois Griffin and aunt of Carter Pewterschmidt, and claimed she was her favorite niece. She died in "Peter, Peter, Caviar Eater" when she came to visit Lois's family before she even set foot in the house. In her video will, she left her Cherrywood Manor located in Newport, to Lois in order for her to begin living the Pewterschmidt lifestyle she had been missing out on. Just like Carter and Barbara, she hates Peter, whom she formerly employed as a towel boy.
She is voiced by Alex Borstein