“I calmly told him that if I was not allowed to discipline her in my home when he left her in my care that he should take her home and not bring her back with him again.”
Several years ago, when my brother-in-law’s kids were over at my house, they were playing in the back yard until one of them would come in, slamming the door behind him/her, to get something. My wife (and others) would ask the children not to slam the door but to no avail. I decided I would have to intervene.
One of the kids was coming in the front door and I scooted him right back outside, stating that they were to stay outside for the time being. Meanwhile, my brother-in-law was talking to someone when he overheard my statement and let me know in no uncertain terms that I was not to talk to his kids that way — that was his responsibility. I told him what was going on and that he was apparently too busy visiting to do anything about it. He got very angry, gathered up the kids and abruptly left. Everyone else gave a sigh of relief.
I fully agree with the author: when you are at my home you follow my rules. When I am at your house I follow your rules. The next time the kids came over they were much better behaved.