This was my childhood.
I was younger than your DC when I started to wonder why our chairs and couches were often damp, and why we had sheets of newspaper under the cushions. I remember hearing my mum getting out of bed in the middle of the night to go sleep downstairs. Once we were staying at my grandparents house (dads parents) and I knocked a cup of juice over at the dinner table. My dad (who was as horrible sober as drunk) went mad, saying what a mess I'd made- I can still remember my mum hissing at him in fury saying what about the mess he'd made in the bed, and seeing a 'look' on my nans face.
One Sunday, my uncle had given my mum and us kids a lift home from shopping in town. He sat down in the armchair and leapt up as if he'd been scalded saying it was wet. He left shortly after, and my mum went upstairs to where she obviously discovered my dad passed out. When she came downstairs, she announced that our chairs were always wet because 'your dad gets drunk and pisses all over himself'. Later she was distraught and apologetic for telling us like that.
But actually, it would only have been a matter of time, as he got worse and worse. Doing it in front of us, in public, you name it. Our house that had always been scruffy, became squalid. (If I ever have a bad dream, I'm back in that house.)
It was shameful, disgusting and humiliating.
Mum eventually left, but not before I'd moved into a bed sit at 16. My father, left to his own devices, well you can imagine. He is now in 24/7 care, with wet brain dementia.
I urge you to leave OP.