My biological father is drinking like that--he drinks as much as he can, all day, every day. Its sad, but there is nothing I can do for him.
He did quit drinking for about 5 years. It really changed him, but when he relapsed, he seemed to drink even more.
For my own sanity, I had to walk away from it all--I could not stay in the mess and try to help him get sober. I had to take care of myself and my own sobriety. I can only hope that some day he will see the light and want to quit drinking before it is too late.