Dad always likes to drink hard liquor, but he can't give it up. what should he do ？

If there is no obvious harm to the body. Then dad can do whatever he wants. When you use words like "This is my life, I am the master" to resist the control of your parents, let them take responsibility for their own lives. If your father is obviously unwell after a physical examination or after drinking alcohol, you really need to sit down and talk to your father face to face. Because different families have different ways to get along, everyone's personality is different. It is suggested to use soft grinding and hard foaming to persuade. Use mild violence when appropriate, show up in time when you know that he is drinking, and help him drink in an appropriate way. If it is for entertainment, or for friends to have fun together, drinking is necessary. Referring to the first rule, he is required to strictly control the amount of drinking. I hope it helps.