My daughter is 7, and loves going out and going over to her best friends from schools house. Today they went to a theme park as a treat while I was at work. I'm very good friends with her mum, I love her to bits. But her eldest is a teenager and a bully. She's going through a hard time at the moment and bullies her sister all the time. Today they had to leave after two hours because she was so vile, and it escalated into physical violence. There's been a series of events that's leading me to not want my daughter going over at all. The teen isn't violent towards my daughter, but can be mean sometimes. She constantly ruins days out even when I'm there, but she can't be left on her own. She's at that awkward stage anyway, and I've tried to be understanding, but where's the line? My friend is afraid to discipline her as she will destroy stuff if she doesn't get her own way. The house is always a state. There's loads of history but I don't want to divulge too much incase it's outing. My friend has her own mental health issues but it's always the excuse as to why she can't stand up to her or tidy the house, and I help as much as I can by tidying and offering childcare but my offers are often met with polite 'No it's okay'. Social services are involved as she doesn't go to school, but I dont think my friend is entirely truthful with them. I'm worried about my daughter's friend, as I dread to think what goes on behind closed doors, but I feel I have to protect my daughter too. I don't really know what to do other than stopping my daughter going over:(