My fiancé and I are getting married next month. His kids have been over to help with the wedding. His oldest is kinda reserved and doesn't seem to like me or anyone. He will drop curse words in front of our 2 year old and I don't appreciate that. My fiancé says he's a teen, he hates people. Just let him be. I try to let him be, but he makes it so obvious that he hates us. Even his own siblings just by how he acts.

I was home alone with him today and he was in the bathroom for like 30 minutes and I start to smell a cigarette. No one in our house smokes and it was coming from the bathroom. I was so pissed and done. I opened the bathroom door and he has a cigarette... but he's burning it on his thigh. We just stared at each other. He had cigarette burns all over his thigh. He told me to get tf out and I closed the door. I kinda just stood there and listened at the door and heard him saying fuck over again and it sounded like he was hitting something. I think it was himself. He came downstairs and I asked why he was burning himself and he told me to mind my damn business. He also said his mom doesn't care about it so I don't need to care about it. I really think I should say something to his dad. Him saying his mom doesn't care. Like she knows he's burning himself? I feel like this is all going to start a fight. Shoulf I tell his dad or just hope his mom will do something.