This is my favorite pizza place in Chicago. It's thin crust, and each pizza is for 1 person. They use all organic ingredients and have a fabulous beer list. The outdoor patio in the back is great, but eating inside the restaurant or at the tables on the sidewalk is great too.
This isn't exactly a kid-oriented restaurant but we take our kids there all the time, and there are always lots of families there.
The other great thing about this restaurant is the neighborhood it's in. Walk along Division St heading east from Crust and stop in small boutiques and stores.
I do recommend making a reservation if you can.