I met my fiancé five years ago, when his son was 4. He has always been a trouble maker, and his dad is constantly making excuses for him because his mom is not in his life because she is a drug addict. I was 18 when I moved in with them, and have done nothing but treat this child like my own. We also have a two year old daughter, together. For the last year or two though, this kid (stepson) has been a LIVING NIGHTMARE. He is messy, has NO MANNERS, and treats me with nothing but blatant disrespect. He is also influencing my almost 2 year old, and not in a good way. She is picking up his bad habits, he takes her outside and runs and hides with her so I have to frantically run around to find her, and he is teaching her some awful words. (Not profanity, just not nice words) I am really starting to hate this kid, but I love his daddy and our daughter. I'm not sure what to do, his dad will not correct him but if our daughter acts up he will correct or even pop her. He even argues with me when I try to correct the kid, IN FRONT OF THE KID. Does anyone have any advice? I don't want to lose my relationship over this, as I think that's what the kid wants. Which I don't understand because I am the only mother-like figure that has ever been in his life.