What is the name of this comedy?

It was a very dry, sarcastic comedy. I think it was on either Fox or ABC. It was about this big family, they were all smart es, especially the kids. There was one scene I remember where this older boy drove up beside 2 of the younger kids in his car and said, "Oh look, equestrians" instead of pedestrians. The show was only on for a couple of months and was cancelled.