My parents separated in 2012 and divorced in 2014. I was 12 and my sister was 8.
My dad was emotionally abusive towards me during my childhood, and as a result I was diagnosed with PTSD, depression, and severe anxiety. I didn't speak to his for three years (our relationship is better-ish).
Anyways my sister turned around when she was 10 or 11 and said all that happened to me actually happened to her, and with a few embellishments like my father raped her and hit her (which is not true in the slightest, and I know it for a fact). She doesn't talk to him and she self harms for attention. When I self harmed, I hid it and no one would know unless I told them. She flaunts it like a status symbol.
My mother slowly stopped parenting altogether. I helped raise my siblings when my parents still lived together, and I became the only parent in the house after. My mom sets no discipline on anyone, she lets my brother and sister do whatever the hell they want, and there are no repercussions. Since my dad moved out, my sister has been caught by police twice, has had the school resource officer called on her, bullied people online, stolen money from me, my brother, and my mother (which my mom blamed on me), and threaten to accuse my boyfriend of rape because she was angry with me. She cusses like a sailor, has no respect for any authority, and drinks my mother's alcohol. My mom has done nothing about this. She's 13 years old and almost 200 pounds, and has a 19 year old internet boyfriend. I mean the list goes on. I had to prove to my mom that she stole her credit card and money from our kid brother. Hell she stole $80 from me, and bought $80 of stuff from the mall with my mom, and my mom didn't think it was related. She's in complete denial and doesn't listen to me at all. I am just sick of living in a house where no one cleans up after themselves, and I'm expected to do it. Is there anything I can do?