Marnie Barrett is two years old and the younger sister of Suzi Barrett and Buddy Barrett, the daughter of Natalie Barrett, and the stepdaughter of Franklin DeWitt. Her step siblings include: Lindsey, Ryan, Taylor and Madeleine DeWitt.
She has curly blond hair and blue eyes.
Marnie hates her playpen. She is allergic to dust, chocolate, dog and cat dander. Her room is dust free for this reason. She sometimes fusses when her mother leaves. She cries sometimes and will talk or sings when she wakes up from a nap. She makes the ham face when she's happy. Her favorite sitter is Jessi and has a crush on her.
Marnie once ate so much Kleenex she threw up.