my sister has her own room and my mom bought her a new bed frame and mattress yet she still sleeps in my room. when my gf and i spend the weekends at my moms my room is always messy, my bed never has bed sheets on it and we get there really late cause it's a far drive. just recently my sister said yes to pet sitting her friend's cat and my gf and i have no problems with cats, but instead of putting her friend's cat in her room she puts the cat in my room and didn't even ask me so i come home to a random cat and a litter box in my room when just last week i cleaned and mopped my room. my mom was defending my sister saying that they don't know how to put the frame together, my sister has a bf but he's lazy and just watches tv with her. I got fed up and locked my door but my mom is mad at me and said my sister doesn't have a bed to sleep in. I'm just frustrated cause I know if it was me my mom would make me build my frame especially since she bought the mattress and the frame.