So my dad is a single parent due to my mother passing away when I was younger, so he hasn't had any other sort of affection from anyone else but me and my sister in a long time. However recently he has been climbing on top of both me and my sister while in bed and giving us unwanted kisses on our necks, I hated looking to my side and seeing my twin sister look at me with eyes saying help knowing she to afraid to say no (her ex had S/A her and said if she said no he would kill himself) but he looked at me weird when I had used all of my force to push him off of me and I started almost yelling no stop, this has been a problem for a while and I'm afraid that it might start getting worse but at the same time it has been quite a few years that he hasn't had any affection from anyone but us so I'm not sure if I should blame him for doing this he is a man after all.

UPDATE: YES my sister will 100% be his first target yesterday when our dad was coming in to give us a kiss goodnight when he went to give my sister one he held his lips to her forehead while rubbing the bottom of her face for about a minute and I had to tell him to stop two times for him to even remember that I was there I'm doing everything in my power to make sure they can't be alone together sadly that also includes telling her to go to school no matter how bad she feels I feel bad for doing that though I think she's also putting in a effort to keep me safe too we also told our best friend so we have a another person because people tend not to believe kids with this stuff, also unfortunately I don't think I'm really ready to report him his job position right now could get me into any college I would like to get I would have a harder time in both life and getting away from him if I were to report him now if it does start to get worse I will report him so for now I will continue to say no and I will continue to tell him were uncomfortable once I get out of high-school I can go to a far away college, I also want to try and talk to him about finding someone else I'm kinda nervous so if you have any ideas on how I can like bring it up please do tell me also THANK YOU this has really helped me out it's not just knowing more about if anyone is having similar things but how to stop it. Also this is my real situation for anyone wondering.