Alcoholic dad

My dad has been an alcoholic for as long as I can remember, it was the reason my mum and dad split up when I was four. I currently live with both of them, half my time spent at my mums and the other half and my dads. It has gotten to the point that I don't want to stay at my dads, he smells of beer, he slurs his words and he has no idea what the word hygine means - I have on occasion found him urinating in the sink, he forgets everything I tell him and he constantly has a bottle of cider on him. My mum has said that I can live at hers if I want to, but I can't, I love him too much and since my sister has gone to university, I'm the only person he has left. We are moving house soon and I hope I'll be able to at least get him to properly clean the dishes and keep the house clean but I'm afraid he won't. I don't know what I'm going to do if he doesn't change, I can't stand another two years staying in what my mum calls 'poverty'.