Simon is the youngest child of the McDonald-Venturi family.
Simon was announced in the episode "Surprise" but wasn`t born until Vacation with Derek. He is the only child of the family whom is born a McDonald and a Venturi. He likes Lizzie best. He is not related to Abby nor Dennis.
- Simon is portrayed by a girl.
- He is the youngest.
- He lives in a blended family.