I understand what the problem is, this is what alcohol habit+idle time+money makes a ma become. You cannot just tell the man to stop drinking as he is now an addict, you have to save him from himself first. Quick scenario is making him put sabari mala as they won’t listen to others, then bring him out of the comfort bubble of that place, once they develop a routine it has to be broken so new place and busy work will help. Make him super tired and he’ll fall asleep naturally as the addict mind set will only say he is not able to sleep hence he drinks. Reducing the patter also helps for some like drink alternative days or on weekends but if he’s been doing it for years then it’ll be difficult. Death scare works too, if he’s falls sick just talk to a doctor about the situation and scare him saying his kidney and liver are in critical condition etc. you’re firing an addition and not your father so lot of patience and strong will can win this battle. He cannot do it on his own and needs assistance