My boyfriend has moved in with me and my kids in my home and we have 4 kids between us. I have 2 girls 16 and 14 and he has 2 girls 14 and 13. His 13 year old is making life extremely hard and I don't know what to do. She is disrespectful, mean and doesn't care about anyone. My boyfriend and I are always fighting about her and I don't know what else to do but to have them move out. I love him and don't want to lose him but we just don't seem to be able to do this together. I am to strick and he isn't strick at all. HELP!