I used to own and run a small (40 seat) FAMILY restaurant; I had a sign posted: "For The Comfort of All Patrons, Well Behaved Children Are Welcome". My clientel was everything from businessmen during the work week, to large families on Sunday morning, and in ten years at my own place, and another 20 in the industry, I've only had one problem.
A lady(?) came in one evening with her two young children, probably 4-6 yrs old; in ALL of my rather long life, I have NEVER witnessed such mayhem... the kids were running through the restaurant, throwing food, bothering other patrons, and swearing (yup, the 6 year old liked the word F**K, a lot).
When I approached the mother and asked her (politely) to get her children under control, she told me to mind my own business, her kids were "just being kids", and if I bothered her or them, she would sue me "for everything I would ever own". I said "No problem, Mam", walked into the waitress station, got a couple styro TO GO containers, walked back her table, picked up her plate, and dumped the contents into the togo container, the same with the kids food, put the containers in a bag, politely handed it to her, and said, "No one here will ever bother you again, not a waitress, busboy, or cook...I have instructed my staff to NEVER approach you or your children again, for any reason, nor may they talk with you or interact with you in any way... including taking an order, getting you a request, or clearing your table. Have a good day."
She turned beet red, grabbed her kids, and stomped out. The tables nearby applauded. Next Friday nite, she showed up with her kids AGAIN. When I told her I could not seat her and her kids, but I would be happy to provide her with carryout food, as long as her children remained in the car, she said "OK", we served her and she continued to be a good TOGO customer, but never sat down in my place for a meal again.
I grew up with the idea that, as a child, I was EXPECTED to behave in public...a couple of spankings got it through to me, and never damaged my tender psyche'. I don't think children are any different today, 'cept maybe the gene pool might be a little more , ah, how should I say... corrupted.
Crusty Olde Bastarde