How would you deal with your sister dating the man who raped you?

[CommonSense1]

I was raped 6 years ago, at the time he was my sister's baby daddy's brother, he told me that if I told anyone that I would never see my sister or nephew again, so I didn't tell a soul. I told my family later that I had been raped but never told them by who, they assumed I didn't know the person. I moved away and just tried to get on with my life, last year I was awoken by my phone ringing, and walked into the living room, and his voice was on my answering machine. I found out that he was dating my sister and that he was the father to my sister's second child. I told her that he was the man who raped me and she told me I wanted it, that it wasn't rape.
I've been trying to deal with it, but get upset every time my mother calls and tells me I need to start talking to her daughter. My sister is dead to me, and I don't want anything to do with her or her kids. My mother doesn't understand where I'm coming from and it irritates me that she won't listen to my side. I don't want to kick my own mother out of my life, but I can't keep talking about it every time she calls.
I've been diagnosed with PTSD and every time she brings her daughter and her daughter's kids up, I immediately think of ways to kill her and her nasty boyfriend.
How do I get my mother to understand?

 

[Narcs]

Instead of talking on the phone, get her to come visit you to talk instead.

I hope everything works out. Keep strong!