I wish my family didn’t always argue

My sister and my mother are constantly fighting and getting into screaming matches and I always end up getting stuck in the middle of it. I won’t lie I usually take my mothers side because my sister just says whatever to argue. My sister has gotten CPS called on my mother 3 times for shit that never happened. My sister never makes things easy. Everyday she always starts an argument and accuses everyone of everything and has ridiculous double standards for things. Like today they got into another fight and it drives me insane, everyone starts screaming and crying and accusing the other of things. My sister keeps contradicting herself and proving herself wrong but she just doesn’t fucking stop. My sister is 19, so it’s not like she’s just young and annoying, but even when she was the arguing was the same. She still throws temper tantrums and has a problem with everything, she’s narcissistic and a liar. All she does is make excuses for why she’s a bitch and argues with anyone and everyone who doesn’t hold the exact view points as her. Ever since I could remember those two were always fighting, sometimes I couldn’t fall asleep because they were in screaming matches with one another. I hate always having to hear them scream and argue, and I just hate living here. I have nothing against my mother, we get along fine and she’s doing the best she can. But my sister makes living here hell, she always makes things miserable and starts fights. I can’t stand it. There’s so much wrong with her mentally and just so much going on I can’t even explain it. I just want her to move out so the screaming stops.