I came home and the home smelt like gas, asked my sister (through her door) what the smell was from, said she didn't know, called my dad, apparently she put a smoke bomb off in the backyard, I went to the fridge to put some food away and she came out of her room, asked her why she didn't tell me she let a smoke bomb off saying that I was worried there was a gas leak, she proceeded to say "it doesn't matter you dumb bitch" and I said "well do you even know the reproductions of a gas leak? What if the neighbors or I called 911 thinking there was a gas leak? Idiot" and she then said "fuck you, you bipolar bitch" as I was walking away and threw gum that was in the kitchen at me and then a fork, she then also proceeded to grab a knife and aim at me and told me to leave when I was going to my room, I said "you're fucking crazy, stop calling me a bipolar bitch when your boyfriend has schizophrenia and you also have borderline, what the fuck is wrong with you" (show her hyprocisy)  and she said "fuck you, you fucking bipolar bitch" (I have BD2) over and over again and was following me with the knife, threatening to punch me and was waving the knife around if I didn't "leave the house" then my dad came home because he was getting groceries, I was in my bedroom, I told him what happened and he said my sister needed to calm down and she then proceeded to tell my dad this exact "she better kill herself before I fucking murder her in her sleep" because I called her an idiot over thinking their was a gas leak and she didn't tell me anything. She makes things so hard for me. I wasn't even home for five minutes. My sister turned 16 a few days ago for reference, she's been on medication for about a year+ and does therapy. Her psychiatrist says she's making progress but nothing has changed. She's very violent and hostile towards me, she one time punched me because I wouldn't let her borrow my shoes that I was wearing. If anyone has any advice I'd appreciate it a lot.