Billy Melanie Campbell is a main character from the television sitcom A New Kind of Family. She is portrayed by Natalie Splavec. Billy is a 4-year old kid from the city of Los Angeles. She is portrayed as a stereotypical young child. The characteristics which make her different from the other children. Billy has a brother named Jake and a sister named Sarah, and he has a father named David. Billy's mother Rose died in a car accident when she was 2 years old.