Elmo's Stepmother

From Muppet Wiki

Elmo's Stepmother appears in CinderElmo. As in the traditional versions of the Cinderella story, the stepmother neglects Elmo, reducing him to the station of servant, in favor of her birth children. Unlike the traditional version, however, her two sons are Baby Bear and Telly Monster. The stepmother, while irritable, is generally less villainous than in other adaptations, such as Hey Cinderella!