Frances "Fran" Sinclair is an allosaurus. The daughter of Louie and Ethyl Phillips, she is married to Earl Sinclair. Fran and Earl have three children -- Robbie, Charlene, and Baby Sinclair.

She is very sensible and does nearly all of the housework, especially in the kitchen. She often feels unappreciated and wishes the family would spend more time talking together. She tries to talk Earl (or someone else) out of making reckless decisions, though she isn't always listened to.