My half sister and her mother is trying to break my parents marriage

My half sister has been ruining my life. I hate her so much I just want her mother and her to move back to Germany. My dads ex wife was extremely mad at my dad for marrying my mom and his ex wife said to her daughter to give my mom he'll every time her and my other sister came over. My other sister is the one that I love her and her sister were controlled by there satanic mother to give my mom he'll. But the sister that I love knew it was wrong to give my mom hell so her and my mom have a better relationship with each other. The one I hate she is a loser high school 22 year old drop out. And she is still giving me and my mom hell. My mom and dad argue about her all the time. When she was younger she ran away to some other town and opened her legs. And years later she had two kids and OMG she tried to commit suicide and for real god forgive I wouldn't be surprised if she did she is so evil and her mother to. Her mother is making my parents marriage going to hell. She made up lies about my mom and she has my dad brain washed. She comes over every weekend and I'm tired of her I want to cuss her out and tell her I hate her so much. More about her mother. Her mother is making her come into our lives and make he'll for us. Her mother wants my dad. But me and my mom are not going to let them take him. That women threw him out he's ours not hers. What do y'all think I should tell my sister? If I tell her something she's going to tell my dad and my dad will get mad at me