Will try to keep this brief. My Dad is an alcoholic. Goes through phases of admitting he is and deciding he's not. He's recently declared that he's not and he has the odd drink now and again. We don't live near so can only take his word for it, but his recent deterioration in health (and history) suggests otherwise. We invited him and my brother to stay for Christmas. They arrived Christmas Eve and left today. When he arrived I snuck upstairs and searched his bag and found 5 squash bottles of whiskey (possibly with some watering down). I said nothing but checked periodically and it all went, including today which is the day he was due to drive home. I confronted him this morning and made him stay an extra few hours. He gave lots of excuses - it was really weak, he only had a little this morning etc. They got home safely but I don't know what to do now. The fact that he did it today, whilst staying with us, makes me sure he does it at home all the time. He drives my brother regularly. Should I tell my Mum (they're separated and have joint custody). Thanks for reading.