What Can I Do Legally?

My sister punched me in the eye on Christmas Day, smashed my wine glass and nearly stabbed me with the stalk of the glass… my dad stopped her from stabbing me… but then told me not to phone the police… but the last few days I’ve had nothing but emotional abuse off my mum and sister… saying I “provoked” her when I really didn’t, I sat there calmly ignoring her attempts to wind me up… had no support off my family whatsoever… so now I’ve made an online police report as this stress is affecting my uni coursework and my mental health and my parents are letting her get away with murder… my dad threatened to kill himself if I called the police, so I told him that that’s a threat and that he needs to get mental health help (he’s gone bankrupt). And I’ve got autism and my sister steals my stuff quite frequently and feels entitled to my stuff and I’ve told my mum that she can’t just go and use my stuff and she ignores me and acts like I’m the one causing the problems when I’m really not, because if the roles were reversed, I’d get punished. Everything has made me so pissed that I’ve made an online police report, but now after my parents have threatened to kick me out or kill themselves I am really worried but I am absolutely sick to death of having to put up with their manipulation. I can’t afford to pay rent on a flat, so im not sure if I’d be able to get social housing, because after making this report I could end up homeless and I haven’t got anyone I can stay with. But this seems better than putting up with their abuse. My sister is staying with us over Christmas but going back home to Brighton in 2 days, but I can’t believe the way my parents are towards me… it’s ridiculous. I also have video evidence of her punching me as I started recording since I sensed threat and felt in danger. I also have a video of her confessing she punched me, to my mum. I told them that all the name calling from her is affecting my mental health and affecting my coursework and my grades, but they shrugged it off as me just making excuses… if it was my sister they’d deal with it differently… I also ate Christmas dinner alone after being hit because my sister didn’t want me sat at the table… it’s been awful.