Is it okay if I yell at my sister?
Why are you going to yell at her?
Because she is a stupid bitch and she deserves it.
You should not yell at your sister for no reason. You should be nicer to her and be more understanding.
It's fine, she knows she's bad. She's been doing this for a long time and it will continue since she doesn't care about how she treats me.
Calling your sister names won't change how she treats you. Try to talk to her and tell her how she is making you feel. You should try to get along with your siblings, show her that you care about her and she might change her attitude towards you.