What would you do?

I'm at a restaurant right now celebrating my parents wedding anniversary and there's kid in the booth next to us, he's standing on the seat and pulled my hair, and whenni turned around to notify the parents he also had a fork in his hand and it looked like he was about to stab me. When I told the parents they asked if I had given him the fork 😒 they made him sit down, that lasted about 4 minutes before he was back at it again. He was so filthy too, food and snot all over his face the little shit.
* we couldn't move tables as the only ones available were for couples and there was 5 of us