Fiance's daughter acts inappropriate with him

Please help. My fiance currently lives in another city. His 10 year old daughter has now moved in with him. Until recently, he saw her every other weekends. There has always been behavior from her that I found unnerving, but I tried to convince myself otherwise. She's a sweet kid, and her and I have a decent relationship. However, now that she is around constantly, this behavior is imo definately disturbing. I also have children, and am a very affectionate person, but her behavior is causing me to see red flags. And, his mother is feeding this behavior and constantly demanding him to spend all his time with her favorite grandchild (his kid). His daughter constantly wants to be touching him. The lower end of this is that she has to be holding his hand no matter what, sitting practically in his lap all the time, demanding constant "look at me" type of attention, and whining when he wants to spend ANY time away from her, getting her gramma involved so that his mom calls when he's with me (even after we have spent a whole day with his kid) and demands he needs to be with his daugther not me. The alarming side of ths behavior includes things like this: his daughter threw a fit when I came up last time and got a hotel room (it was company business). We had one bed and we only get to spend one night a week together. We had also spent all day with his daughter. We hadn't dropped her off more than 30 minutes when his mom called demanding he should be spending time with his daugther and needed to come get her. He gets frustrated but he jumped up mad and did it. His daugther then ends up in our hotel room, with one bed. I was so mad. She continued to whine, about I don't know what. We were watching a movie, and I was seething. She was practically laying on top of him, gently stroking his face, playing with his beard, rubbing his belly, and giggling and whispering in his ear, just generally kind of acting, I hate to say it, slimy and smarmy. I was very uncomfortable and almost left. He seemed oblivious but was kind of ignoring the behavior but yet also not stopping her. I have to say, while his daugther was acting this way, it felt almost as though anohter woman was fondling my man, my stomach was tied up in knots and I kept hoping to convince myself that it was all in my head, but honestly it was just too much. This girl's mother has a very inappropriate physical relationship with her own father, her mother's other teen daughter (who's not my fiance's daughter) also has acted similiarly inappropriate around my fiance, to the point where his family has discussed it. So, of course it's not too far fetched to think sooner or later his daughter is going to pick up on this behavior from her mother and half sister. I need to talk to him about this. But how??? I don't want to imply that I think his daughter meant to act sexually toward him and then he get defensive about her. I also need to stand up to his horrible mother who actually told me flat out that he needs to be spending time with his daughter instead of me (and I only see him once a week). His mother has made several comments to me along these lines, letting me know that I don't count and that even seeing me once a week without his daughter is unacceptable. She has also nagged him about it too, I know he feels controlled and frustrated and guilty. When his mother has said these things to me I'm usually taken aback and just mumble that I'll have him call her back later and hang up. I need to stand up to her. help!!!

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