What Should I Do Now? 10 Pts.?

I'm 14, and my dad has had cancer for two years. I never really got really close to him, to ask him questions, to gain his wisdom that he has had. He's a really smart guy. Knows about cars, the house, gardening, engineering, etc. I didn't really even ask him about his childhood. And even though my mom told me to around December, when things were getting worse, I didn't. And, because of that, I will never be able to forgive myself. He's in a really bad shape at the moment. He probably has just about one month at max to live. It really is hard, now that I really thought about the reality that I'm in. When he was ok, he'd love to see me come home with a Straight A Report Card, or an A on a test. If he came home from work stressful, everything would be fine. He always wanted to see me get a Master's Degree when I graduated a university. When he was told he had cancer, I remember the day he told me "Well, I guess I'll never be able to see you graudate. Take care of your mother and brother for me." It really is hard, and now I don't know what to do. I feel bad because he had so much knowledge that I didn't ask him about. What can I do now, I really am lost and in shock. Thank you.