My alcoholic sister is a demonic little swine…at wits end help?

I’m 28 and she’s 21.

she was diagnosed with high spectrum autism as a teenager so has social issues, not severely but has social anxiety. She’s never had friends and been a hermit her whole life. She abuses my elderly parents to get her alcohol every night and before you say why do they do it. If they don’t she damages property and acts like a psycho. Police have been involved many times and don’t do much because they reckon it’s a mental health issue.

i ended up moving back home to help my mum who had a stroke (while getting her wine) and she also seperated from my dad.

I've been living with them for about a year now and it’s been fucking miserable, I hate her guts. She says she’s depressed and no one cares yet I’m always trying to get her out but all she wants to do is eat drink smoke weed and sleep.

just tonight she threatens to stab herself and I had to chase her to get the knife of her, I’m also scared because my mum tries to and I’m scared she will accidentally stab my mum.

she physically abuses me and punches me when she’s drunk and damages the beautiful house I’ve made for us.

there is no where for her to go, the cops don’t wanna arrest her. I’m at wits end that I actually want to physically beat her up and knock some sense into her,

so tired and she drains the living soul out of us

My alcoholic sister is a demonic little swine…at wits end help?
Post Opinion