Should I speak about my past of the man that raped me?

Its long but I'll make it short. I have 14 year old sister that doesnt talk to me anymore because of the simple fact that her father raped me few years ago. (He's my stepdad) I seemed 2 notice I believe to have a grudge against her father but I also found out that she lied to me that she has been seeing him. My mother is another story but she is a horrible mother that put me into alot of things a child wasnt suppose to be into or know about. Basically, I want 2 speak to my sister again but everytime that man's name comes around, I scoff and become disgusted. I hate him, I try not to think about the past nor speak about him. My brother thinks I should talk for I can heal. Do I have a grudge or Am I being a person with hatred? I mean should I speak to him again because of my relationship of my sister or forget both of them. It is her father but I'm so frustrated that she's talking to him.