Children that young might be a bit overwhelmed. There is no pop/soda, just lots of alcohol (and water, and even that is supposed to be for rinsing out your wine glass). The menus change every week with different chefs so it would depend on how adventuresome your children are. As an example, one of my favorite items was Thai duck with asian slaw and mashed potato. A couple of years ago, I remember that one dessert even had alcohol in it (or tasted like it did). I don't think there is a price for children either. I seem to remember that the price was 99.00 no matter the age.
I have seen children there but it never seemed like they were really enjoying themselves. It's rather dim, loud and, very, very crowded. You wander from booth to booth "tasting" (and trying the accompanying wine(s) if you so desire). Sam Adams beer also has a booth.
Cyn