I have a really lovely friend who really enjoy spending time with. She has a DS who is a year older than my DD. The problem is, when we meet up, her DS is really awful to my DD. Last time we met, he pushed her off a chair, pulled a drink out of her hand and threw it on the floor, threw a ball in her face and burst her nose and kept calling her names. My DH and I kept trying to be firm with him and telling him to stop but there is only so much you can do when it's not your child. My friend kept laughing it off as him being a 'typical boy' winding up her up. In the end, she spent the afternoon sitting on my knee as she'd had enough. I tried talking to my friend about it but she thinks DS is just trying to be funny and showing off. Friend has sent a message today to ask to meet in the holidays with kids. I'd love to see her but just can't face another afternoon like that. I know boys (well, all children) can be rough but I don't think behaviour like that should be excused. Surely he needs to learn not to hurt and to respect other children. What is my next step here? Do I try talking again? Do I go and just keep intervening? Do I decline the invitation?