What is the way to prevent a father who sells alcohol from this action, after all attempts at advice, pleading, and threatening to leave the house have failed?

Drinking and selling alcohol are among the greatest forbidden major sins, and there is no difference in prohibition between a small amount and a large amount of it, based on the Prophet's (peace be upon him) saying: "That which intoxicates in large quantities, a small quantity of it is unlawful." Advise your father through admonition, and by giving him booklets and tapes about the prohibition of alcohol, and direct him to people of knowledge and righteousness. If he does not respond, then leave the house and refuse to take money earned from selling alcohol. If he still does not respond after all of that, then you have fulfilled your duty, and you should pray for his guidance.