How to deal with a lieing mother?

So i told my grandma about the affair my mother is involved in, and blackmailing me over, And i also told CPS about Monday night about an abusive situation with my brother. My mother is lieing to everyone, and saying im just a nut case, Thankfully they dont believe her, But one person does, and thats my dad. She's got him convinced that Im just the devil and trying to ruin his life. I havnt spoke of one word to her in 6days, she just comes in a starts yelling at my frequently, She came in tonight, and was yelling at me, and cussing me out, telling me in worthless, and she said was calling me a ***** and asked me a million times why i wont speak to her, I finally broke down and said" I have nothing to say". I know your mom is someone you "fight" with, but my mother has set me up all my life, and Emotionally abused me. She has scared me for life, If i could sing a song to her i would sing "Because of You" by kelly clarkson. So how do i deal with this? What can i do?