<human>: I can't take it anymore. I live with my 10 year old sister and my parents and everyday is constant screaming. She's arrogant and self-righteous and disrespectful. My parents are nice to her but she abuses of their patience and doesn't listen, screams all day at them and mocks them when: she doesn't want to go to sleep, doesn't want to do her homework, doesn't want to stop being glued to the TV for 5h straight, doesn't want to come for supper, doesn't want to brush her teeth, etc. She screamed at my mom that bought bed sheets that she didn't like. She screams at my dad when he tries to be playful. She screams and says that she's gonna do what she wants etc, etc. Meanwhile I'm in my room trying to study, or doing whatever but I can't. It's constantly stressing. 

My parents aren't raising her, they're letting her get away with everything. They don't punish her. She's learning that if she screams and mocks she'll get what she wants because my parents will stop arguing so she stops screaming. Basically they'd be like "ugh" and keep doing their stuff, and start telling her to do wtv she has to do 15min later and get mad because she still hasn't done it. And the cycle starts again. It's stressing that all day they're screaming and there is no way it's getting better because my parents aren't educating her. I even tried to talk to her plenty of times, and when she does that to me and I try to put her back in her place and raise my voice my parents get mad AT ME because it's not MY PLACE to educate her. BUT NO ONE DOES. SO I GET YELLED AT AND SHE LEARNS THAT HER BEHAVIOR IS OK. I CAN'T TAKE IT AND IT'S RUINING MY RELATIONSHIP WITH MY FAMILY. HELP.

Summarize the given text in a few sentences.
<bot>: 10 year old sister acts like brat because parents aren't educating her. Her constant screaming is ruining my mental health and my relationship with her and my parents. Help me please.