This is crazy but you actually sound like your describing my dad.
My dad was an alcoholic since..well since I can remember and every time he was drunk he would start shouting and swearing and even fighting with random people at the bar or on the street. Living at home was always a nightmare I couldn't stand it he said so many horrible things to me and my sisters and punched my sister up and she simply stopped speaking to him and cut all contact with him.
We had to call the police on him as he came home drunk as always and started swearing and making threats at me and my then pregnant sister.
He doesnt drink anymore because he lost his job and "changed" despite this he still has anger issues and swears and rants about every damn thing. To be honest I'm 19 and after all these years I guess I got used to it and just block it.
I know exactly how you feel like you cant stand him in the house and the awkwardness, you just want to get away or run away somewhere far and never come back.
It's hard sometimes to speak to people that are close because they don't really understand. I said to someone I don't love my dad and the person started giving me a lecture about "his family" and all that crap but I honestly think blood only makes you related, If the person doesn't act like family or does not give you reason to have love for them then don't force yourself because they are family
I would advice you to stay strong, particularly for your mother and little brother, she may want to live him but maybe stays with him to keep the family together. You should try joining a recreational activity that will let you get out of the house and blow some steam off. Other than that I would say try your best to ignore him because clearly you cannot reason with him any more.