Grace Diane Cassidy is Kat and Karl's mom and a psychiatrist who works at home.
As seen in the photo at right, she wears a long red coat with a yellow undershirt, and has blue eyes. Kat inherited her hair from Grace.
She is a kind-hearted mother with a positive attitude. She likes Kenny although sometimes he scares off some of her patients.
She was born in 1961 in San Francisco.
- She has almost a beatnik look, according to the show's Wikipedia article.