How do I handle this situation? I'm sorry this is so long, but I really need help right now?

Ok, I will try not to ge too long winded here. Here's the issue: My dad and mom divorced when I was three, my brother was 4. My dad remarried my step-mom when I was 4. I am now 26 and my dad is still married to her. She and I have NEVER had a good relationship, and she recently said something to me that makes me never want to talk to her again. Before I get to that, though, here's a little background on our relationship. When my dad worked days, she would lock my brother and I out of the house ALL DAY. We couldn't even go inside to go to the bathroom. This started when I was five. By the time I was seven, we were doing our own laundry because she said she was grossed out. My brother and I had to shower the minute we came home every day because we were filthy kids to her. When my little sister was born, I was five, my brother was six. My step-mom went to her mother's house with my sister and told my dad that she wasn't coming home until my brother was gone. He wasn't a bad kid at all, he was six years old and she just didn't like him. So, what did my dad do? He sent my brother away to live with my grandparents for a year. He didn't even fight for us. There are so many more situations and incidences that I could go on and on. It has been painfully obvious through the years that she has never liked us and she has always treated my sisters (she had two girls with my dad) so much better and actually cares about them like a mom should. And, my dad has known what has been going on but he's never fought for my brother or I when it comes to her. He's been turning a blind eye all these years. What did she say to me that has invoked such strong feelings of hate? Well, back in March, she felt it was ok to tell me that she doens't feel the same way about me and my brother that she does my sisters, she never has and she never will. Like I said, that fact has been so obvious from the beginning, but what would make someone even THINK that that is ok to say to someone? I have never wanted anything from her except for her to be a mom, which she could never be. She knew that my dad, brother and I were a package deal before she married him. I want to sit her and my dad down and tell them exactly how I feel. I know that it would be very self-serving, but ever since she said that to me, I can't shake it and I feel like I deserve to tell them how I feel. I don't want any excuses or answers or explanations, because nothing will change what happened. I just want them to know how hurt I am. Frankly, I don't care if it means the end of our relationship, since there wasn't anything positive in the first place. I am tired of breaking down and crying week after week because I am still so hurt and angry. I thought that time would help heal me, but it hasn't I am getting more and more angry. What do I do? How do I even begin to approach this situation? Thank you so much for taking the time to listen and help me. I really appreciate you!