I hope that you manage to find a way to moderate your dad's drinking as it can cause real unpleasantness. My mum was drinking up to 4 glasses of red wine every evening at one point and it was making her really unsociable, emotional and argumentative, and dad often found it impossible to get her to go to bed. It was before she had a diagnosis of dementia but in hindsight she was well down that road already; maybe she felt that the wine made her feel better, or that she just didn't remember how many she'd had. Eventually, after I'd said how worried I was about it, dad tried diluting the wine, and then properly swapping it for cranberry and red grape juice which he served in a wine glass in the evening, and even topped it up for her. We weren't tricking her as we brought the tetra-pack bottles to her when filling up the glass, but she never queried it. Both my dad and I learnt to intercept any real alcohol that other people gave her even though they sometimes thought we were spoil-sports! When she came to live with me, I continued the routine, so right to the last, mum was able to enjoy a drink from a wine glass to mark the beginning of the end of each day. I hope things improve quickly for you Narwhale.