For several years my elderly father has come to ours for Christmas. Every year he wets himself. Sometimes while sitting on the sofa, sometimes he doesn't make it to toilet in time and leaves puddles on the floor. He also leaks I suspect and doesn't change his trousers so sometimes absolutely reeks. He seems completely oblivious. I've tried getting an older family member to gently broach the subject to little avail. He stinks right now and we have people coming round. But how do I tell him on Christmas Eve that he needs to do something. Note this is only an issue when he drinks but he drinks whisky constantly.