How can you know for sure if a father is doing sexual things with his daughter?

[SHY1999]

My bf of 9 years has never really had much to do with his daughter, he has always been more focused on his son because that's "his boy". In the last month or so I've noticed that his daughter seems to, in my opinion, be in love with her dad. She has never cared he hasn't had anything to do with her because she has me and my daughter that are close to her. The last month or so she has walked in on him going to the bathroom and she just stood there and watched him (he didnt notice at first) and yelled at her to get out, another time he was in the shower, I went into our room to put laundry away and she was sitting on our bed waiting for him to get out of the shower, I made her leave. Now she cuddles with him and lays on top of him like I would, she gets absolutely mad when she sees him and I laying on the couch together, she got irrate with her brother for interrupting her and her dads "alone time". Tonight I witnessed them kiss ON THE LIPS, she is 10. That is NOT normal to me. I have never seen them kiss on the lips in the 9 years I've been around. I feel very creeped out. NORMAL?? NOT NORMAL??

[uncle63]

Hopefully she’s just seeking her dads attention. Unless... something sexual has already happened between them and she is expecting more from him. Have you tried talking to her alone?

[AnnieBrooke]

typo -- "lie" around on top of him, not "like"

[AnnieBrooke]

Just attempting to kiss a parent on the lips at age 10 does not mean there has been something sexually improper between the parent and the child. It could be the child making a play for her parent's attention and affection, doing it the way she sees it done by people on television or in movies, which is of course not the role model for a girl and her dad (but at age 10, how would she know? Kids imitate what they see demonstrated.) You say you would like around on top of him? Is that in front of her? Maybe she wants his attention and approval and her dad ignoring her and favoring his boy has hurt her.