How to get somone to stop being obbsesed with cars 0_o?

You should try to enjoy the cars and learn about them. They are a visceral connection to an era of America he feels is slipping away. He probably sees them as very legitimately rare and valuable collectibles that can easily triple in value in 10-20 years. And they are priceless if one can have such a machine and afford to really drive it and use it as a passenger car. Has someone passed away in the family, such as a grandfather or uncle, that used to own the cars or similar vehicles? Perhaps he is coping with a loss and this is his way to deal with grieving. Show him some respect and play basketball somewhere else. Invite him to play ball with you or do other sports. Talk to your mother or other close family about the spending problem, and do not confront your father about his spending. If it was money that you (and other members) contributed expressly for a vacation, then he should feel guilty. But if it was his own money, you have no right to object, even if you feel inconvenienced by his choice to spend it elsewhere.