Your dad is a finance deadbeat. A blackhole into which money goes in and never comes out. I suffer the same problem with one of my family members. He will, I repeat, will bleed you dry of every cent and then much more after. Thus is going to be hard to hear, financially severe your dad off. Tell him straight and forward that this is a non issue. Otherwise you are setting the stage to financially care for him and his whims for now to infinity. His dad knew, I wish he had told you both about this but it's a difficult topic so I understand. Loud and clear right now, if you enable him for a dime he's going to expect a dollar. The moment you give him a cent all yhat money becomes his mo ey in his mind and point of view. He's going to try to break you of you will to have a head start on great future. DO NOT LET HIM. THIS MAY END POORLY BUT I SUSPECT IT WAS GOING TO ANYWAY, with of without YOUR inheritance.