I feel like shit is about to go down

My parents, brother, and I moved up here a year ago, and with it came my dad's alcoholism and bad temper. this was never really a secret, we've been dealing with our for years, and all I'd grown up to know was my parents arguing that sometimes got physical. within the first two weeks, my dad had driven us home drunk, nearly having a head-on collision. I woke up late one night to my mom crying her eyes out saying my dad had choked her and pinned her up against the wall. this was shocking to me because although their fights did get physical, it never got THAT bad. he was beyond drunk that night, we all knew it. but this was new.

he agreed to cut back on the drinking, and he had, but my mom recently had a party and a lot of alcohol was left behind. by a lot, I mean damn near a case full.

my mom and I knew this wasn't good. well, he's been drinking it, and he's been drinking a lot. it finally came to an end when I found my mom in the next room, she told me he was telling her to kiss his ass, calling her stupid, saying he'll beat her ass if she tried to do something. I managed to talk her into getting rid of all of the alcohol, it's in the trunk of my car right now. but I'm afraid that when he goes to look for it tomorrow, things are going to go downhill-- fast.

I feel for her, I really do, but I'm only 19 and it isn't my place to do anything. I'm not sure how much more she can take because the man is abusive and an alcoholic.