When I was a manager at a "family" restaurant, we always had parents that would come in with large groups of kids (example: party of 10, but 4 adults, 6 kids) and want to sit at separate tables. At first, I didn't think too much of it, as when I was a kid, my parents would take me and my friends or cousins out to eat, and we would sit at a nearby table and play "grown up" and my parents tipped accordingly. However, it seems that now, some parents use this as a babysitting service and ignore the "kids table".
It finally came down to us putting together a policy that the kids would be seated with the adults or the party did not come in. The kicker was a group that ignored the kids behavior, even when they were throwing food, silverware, knocking over each others drinks on purpose, and driving the other patrons crazy. I ended up having to reprimand the kids and then speak to the parents, who stiffed the server (who then had to clean the section they were in, although we all pitched in and helped).
Its one of the reasons I am out of food service now.....