Op, I was in your situation years ago.
I was young when I had my son. My DP always drank a lot, as did I if I'm honest, but the birth of our son changed that for me.
My partner however, carried on. He'd always minimise his drinking, saying he wasn't an alcoholic as he worked and he didn't drink until the evening.
He did work sporadically, but would often lose his job due to his drinking. He would drink every night until he passed out and would wet himself.
If he was working, every Friday evening I'd wait for him to come home; knowing that if he didn't arrive by 6pm, then he'd be on another of his benders.
He would often disappear the whole weekend and I'd have no idea where he was.
He stole from me to buy drink. He stole from our son to buy drink.
I'd find empty bottles under my sons cot, down the side of the sofa, hidden down the back of the oven, in the attic, in the garden.
I spent my time walking on eggshells. Afraid of upsetting him when drunk for fear he'd punch walls, slam doors and shout and scream. My son witnessed this and was afraid.
He blamed his drinking on me- saying I nagged too much or that I made him unhappy.
I finally made him leave one day, when I'd woken him up as his work was ringing him asking where he was. He was so drunk, he was still incoherent at 11.30am.
He eventually got up and started punching walls and screaming abuse at me. I had my son in my arms who was screaming in terror. He was 2 years old.
I attempted to ring the police and he ripped the phone from the wall. Luckily the call must have gone through and the police arrived at my door and took him away.
He didn't bother seeing my son, instead, he chose to drink himself to oblivion and ended up in a homeless hostel where they attempted to support him to stop drinking. It didn't work.
When my son was 9 years old, I was told his father was dying. He was only 30 years old.
I got in contact with him again and he was trying not to drink. I agreed to let him see my son for weekly supervised visits on the provision that if he turned up drunk, I'd send him away.
He managed about 8 of these visits and then passed away aged 30.
My son doesn't remember any of the violence or abuse and doesn't remember his Dad as a drunk. He does know however that his Dad chose to drink rather than have a relationship with him.
You can't change an alcoholic. You can, however, improve your son's life by getting away from this man.
You are bringing your son up in an abusive environment. Get out now before too much damage is done.
My son is now 15 and is a happy, successful teen. Things would have been very different if I'd stayed with his Dad.
Sorry the post is so long. I just wanted to share my experience, in the hope it will help.