I just witnessed a serious situation and I need everyone's opinion, however negative ones stay away.. not in the mood at all. Constructive criticism is welcome though just no name calling or anything as such

Okay so I'm listening to music and my dad asks if I liked the song I was listening to I said yes and he asked why I was getting smart. Before that though I asked "Yes, why?" and then started claiming that. I'm like "OMG" and continue. He asks how my cheating cousin was doing on Facebook because she is running her mouth about our family after cheating on his best friend with somebody on Facebook. I shrug my shoulders and say "I haven't been there" and then he claims I ignored him and starts cussing and yelling as loud as he could saying I'm disrespectful for not answering but I did with a shrug and said that I hadn't been on Facebook too much. He threatened to take my computer and Internet away and was using my glass for a drink of milk with dinner and slung it and broke it to pieces. My mom was crying and scared to death. I didn't say anything because I knew what he was doing-- drinking alcohol. Quite frankly I cannot take it anymore. People are giving me trouble in real life, on an online forum, I'm very occupied with shit right now, I can't take much more because I quit Karate and Zen which was a big source of handling my stress and emotions other than talking to my fiancee. I don't know what I did wrong but then all this happened. He apologized but I want to disown them.. all of my family. I've taken enough of this in my life.. it has been far worse than this before, far worse. I need to know what everyone's opinion is on this. I want to move out so badly now.. get a part time thing, see this man to publish my book at a cheap price, then move to New York City to pursue my acting dream once I have enough for a car and utilities and all that. I know I should move out but the hard part of that is the economy but I just can't take much more at all.