Afraid my dad may die soon?

First of all, I'm glad to hear that he's okay and recovering from his heart attack. The best thing you can do is help him to follow the doctor's orders. He sounds like an active person, but if he suffers from genetic heart problems, sometimes there can be too much activity. He may want to get back out there, but if the doctor says not to or to stick to light work outs, help him stick to that. It's hard, but it's for the best. I wish you the best of luck. Your dad is lucky to have a caring son/daughter like you! Just give him lots of love and support! Best wishes.