I think at that point, I would have asked the waiter to pack up the rest of my lunch so that I can take it back to the office and eat in peace. Make it clear to them that this is the reason why I'm taking my lunch away... I go to a self-service restaurant in a local mall once in a while, which is frequented mostly by business-type folks, having their lunch. I specifically go there because the food is good, fresh and lots of variety, on top of that you get in and out quickly. I work in an environment where I constantly deal with people, traffic, requests, etc, so it's nice once in a while to just "get away" for an hour, be by yourself (not have to talk to anybody) and enjoy some quiet time while you eat your lunch. It's irritating when that is ruined by moms with unruly kids. Most of the time they are oblivious to what goes on around them.