My boyfriend and I have been dating for three years. His daughter was 10 when we started dating. Her father divorced her mother and was remarried and divorced again before dating me. She said from the beginning that she didn't like her stepmom and was glad she was gone. She spent days with us and pretty much spent the summers with us. All of a sudden, she started talking to her old stepmom and started turning against us. She would lie about it. I was furious because we gave and gave to her. She then apologized for what she did and things went back to normal. Then she did it again and was extremely mean to her father saying really mean things. Sticking up for her old stepmom and putting down her father. Her stepmom used this in court because they have a 5 year old son together. She then stopped and started being nice again. We expressed our concern and explained how we felt about the lies and the back and forth. This is really affecting my two children who are 9 and 11. Needless to say, she has just done it again. She quit talking to her father, but goes and stays with her stepmom. She then sent a letter saying she misses him and wants him to remember she is his only daughter. She even said she sat by the phone waiting for him to call her on Father's Day. I was pissed. She is 13 and can call him. He called her after receiving the letter and she spoke for maybe two minutes. Two days later, she went and stayed at her stepmom's house and hasn't spoken to him since. Her stepmom even came to our house to get their son and she went and waited for them at her stepmom's house because she didn't want seen with her at our house. I am to the point where I am done with her crap. I feel she is old enough to know better and is playing games. I want to pack her stuff up and send it to her mother's house. They moved into my house. I don't want her around and could care less about her at this point. What should I do? Am I wrong?