I'm a big fan of Pegasus pizza (particularly their crust) and it's locations is great, at Alki beach.
It's your usual pizza joint, with standard salads to boot.
It's also kid-friendly in a sense that they accommodate families with children BUT my friends and I have noticed how it seems all families with babies are in the back (right) part of the restaurant, so seemingly out of sight out of mind? It's fine in that you don't have to worry other patrons BUT the back location isn't necessarily the most convenient for families as this is where the entrance to the kitchen is so you always have staff going past you and your kids.
For this reason, I mostly get my pizza to go.