I would have to say Artist Point. There is a special wall at the entrance with the "artist of day" where there are kids drawings restaurant. I think most restaurants do have the coloring pages, but this one is on display. There are always children in the restaurant, and if they do get a little restless there are rocking chairs outside on the deck and a fire pit to enjoy.
Citricos is child friendly. It is brightly colored and has a larger child's menu
California Grill, Narcoosees, Flying Fish and the Yachtsman Steakhouse can get really loud and the dinners are normally 1:30-2 hours so keep that in mind. FF & YS are really dark inside too. CG has the opportunity for fireworks viewing and you can access the observation deck.
Jiko is the most adult oriented-you will not find many kids here.