What should i do? My parents keep arguing?

[Yuuki]

I am 15, and I have a little brother who is 9. My parents keep arguing everyday and night. It's depressing and i don't want my brother to think much about it. The reason my parents married each other is because my mom is pregnant with me, but i think they love each other even a little. They keep arguing about this girl who is a total slut. This slut has multiple rich boyfriends who showered her with gifts, all who doesn't know about each other. When one of her boyfriends broke up with her, she starts seducing my father. Once when she came to my house, she openly badmouths me and my mother. I was really mad and when i want to throw her out of my house my father defended her. And she just laughs! The nerve of that whore. Usually when my parents argue, they start to throw each other with vase or knifes. Most of the time when they are done arguing my parents have broken bones and minor injuries. Personally, I dislike my father as he always ignores us but I still care about him. I had always wanted to leave the house when I become old enough, but the thought of leaving my mother and brother always bother me. Please help me, I really don't know what to do and I don't want to watch them fight anymore. And help on getting that whore out of my house. I really appreciate your answers, thank you!