My sisters is so annoying pls help?

ok my sisters back as she has summer holidays from uni. but ever since she came back shes been so annoying and doing my heading. now thats shes came back shes ruining my summer to. she is the oldest. and iam in the middle and a boy and have a younger brother. when she comes becuse she when shes in uni she has a place all to herself and always used to getting things her way. she phiscally would grab the tv remote from me and just watch what she wants. also when i fight with her. she gets my little brother and they both pair up and turn against me. i dont know whats up with my brother she treats him like sh** but hes always kissing her a$$. sometimes she tells him to shut up whens hes talking and he still does it. i think hes scared of her becuse if he says anything against her. she will pair up with me. and try to get me to turn on him. when were in the room shed be talking to my little brother. and when he speaks to me she give him the evils and nip him. its akward i pretend i dont care and try not to. but by my body launguage you can tell. i try to move out the room but then i thought she cant make me feel uncomterble in my own home. i tell my parents but they say iam the problem. i want to punch her in the face but then my dad would hit me becuse it his little perfect angel. she annoys me so much. i hate her. the problem is she doesent want to say sorry for her mistakes and neither do i becuse i havent done anything wrong. and dont say sit in a room and discuss your problems this isent jerry springer.