I am overreacting to be frustrated by this and how should I handle it? My 7 year old was badly behaved in school this week, two of his friends were fighting and he was part of a group chanting 'fight, fight'. He has been punished at school and at home I told him why this behaviour was unacceptable and banned him from computer games for the week. My DM looks after him one day a week when I got home he was playing games on her tablet, I told him off as he knew he was banned but DM said that he had told her this but that she had told him it was ok to play on her's. (With hindsight I should have explained the punishment fully before I left him with her). When I described what he's done she said 'well kids do that' in front of him. I said that it wasn't ok to encourage people to fight and that the teachers and I were very unhappy with his behaviour. My DM does a lot for us and I love her very much but I don't want her undermining the messages that the school and I are trying to give DS about the acceptability of this kind of thing. I haven't had much success asking her to do things differently with DC in the past, she gets offended and we end up arguing.