Question about daughter and son?

Tit for Tat, seriously...the kid needs to stop and no other way will he get it that it hurts. She is becomming a young woman now and so its getting to be even more inappropriate. He should also know that you can't do that to any one, seriously..if he were to do that to a girl at school he could get in serious trouble, also needs to know that if a man were to do that a woman could sue/file charges, so basically even adults cant do that...so thats how serious it is that he needs to stop...maybe that kind of an explaination will help him stop. Good luck, kids like to play grab @ss but there comes an age when its no longer playful, it hurts someones feelings and becomes an invasion of personnal space for someones body. Good luck, I think he will understand and hopefully with a taste of his own medicine stop teasing his sister with that, take care~