i have a question about my sister BTW I'm 18 shes 19 lately my sister has been sitting on my lap for a while now when my parents aren't around, when i sit on the couch and i watch TV for like 2 hours and then my sisters says what u watching I say the Terminator 2 and we have a huge couch so much space and she just comes with her bag of chips and for some reason on her underwear and for no reason out of ALL THE SPACE SHE decides to sit on my lap the other also like 3 weeks ago i was sick i stayed home for school my parents aren't around cause there working my sister comes home from school i'm sleeping in my bed and she just walks right in and she lays down in my bed with me i was about to tell her to pis off but i didn't have any strength to do so so i woke up like 5 hours later she was still in my bed and i go sleep somewhere else the next day my parents have the day off since it's Sunday i tell them the situation about my sister's behavior and they don't believe me because she always has A in class shes very educational with everybody and stuff, i try to convince them into buying cameras but they say that is way to much money, so the very early the next day like 5 am she comes wakes me up by literally puning my face she told me why i accused her of her behavior, well we ended up fighting she b e a t up me because she knows everything she knew karate and she ended the fight by kicking my bals and that was the end of me so now my sister is the boss when my parents aren't around i fight her she always end up beating me and my parents don't believe me what should i do