I have been with my BF for over three years, been living together for almost two. He has a son 20, and a daughter 15. It took me while and some trying to get to know his son, these days he thinks Im cool so its all good with him, but the little 15 year (Zoe)....that's another problem! Make the long story short, for the past two years Zoe came over to our house to spend time with my BF, she loves her daddy and she liked me. We all went places, watch movies laughed everything was perfect. I do, have to admit that I enjoyed watching her go back home. Couple months ago, Zoe got in the fight with her monther, chose to live with us. Supposedly my BF's ex lost control over 15 years old little girl. I almost had an anxiety attack when I heard the news!!! So Zoe is presently living with us, so much tension around here its unbearable at time. Thank god its summer, so goes for sleepover or grandma's house, little by little it helps. Last week my BF son, another step daughter 17 and our Zoe were hanging out all together in our place. One day after work, I came home and the kids were sleeping all over the place even my bed!!!! Zoe was sleeping in it. I got mad! The kid is taking over the whole place, thinking everything belongs to her daddy... In a low voice I said : Zoe please go sleep in your room, she gave me the dirties look ever!!! Now every time I come home I get hellos from the other two kids but Zoe. She is upset, I asked my BF to put a lock on your bedroom door. Zoe told the older siblings that she wanted to tell me off, and she is annoyed with me. Despite that talks between Zoe and her father about boundaries and respect, she did it anyways. Older siblings advised little Zoe that Im family and she needs to respect me, becouse Im not going anywhere...In the end I need advise to how to handle moody, messy, don't know any boundaries, everything belongs to my daddy and Im just a freeloader teen....