For context: I (18 TM) live with my brother (20 M) and our mother (44 F) who is soon moving out. Shes moving in with her boyfriend who she stays with during weekends. When she came home on sunday this week we went to the KPDH event and I went to bed directly after because we got home late and I had to get up at 4 a.m. the next morning. When my mom was giving me a ride to work (I usually walk) she starts asking me why the dryer door was dented and broken. And she interrogated me the entire time when I told her I had no idea, and my brother was the one who was using it. That night my brother and I are on the couch watching a movie and she forces us to pause it so she can grill us some more. My brother continues to claim to have no idea. And I still had no idea he did it. She ordered replacement parts and fixed it today. Well today I asked my brother if he did it and he told me "yeah I got mad and hit the door". He lied to me and my mom. After she fixed it she asked one more time and I denied and so did he. My mom them called me a liar and thats when I snapped and ratted my brother out. Of course he tried to lie. And that dug his hole deeper. Hes now paying for the cost of repair and isnt allowed to touch the dryer without supervision from me or my mom. He called me a bitch and called me a horrible sibling for throwing him under the bus. My mom was going to make us split the cost and I wasnt gonna let him lie about breaking the door. Am I the asshole?