Mortality

Miles & Papaw earlier this spring
I just found out yesterday that my last surviving grandparent, my Papaw, has lung cancer. It is not so advanced that he'll be on his death bed within the next couple of weeks but there is no turning back. All I keep thinking is how much he has done for me ever since I was a little girl and how crazy he was about "the princess" (I was first-born and the only girl out of all my cousins). I got spoiled rotten and not only did I know it, I relished it. I love my Papaw just as much as he loves me.
Over the years I've become selfish with the whole "growing up, moving out, getting married, having a kid, losing touch" crap and feel regretful I haven't spent as much time with him as I should since becoming an adult. When someone in my family becomes terminally ill it takes precedent over anything else in my life and I spend maybe a bit too much time in reflection of my life experiences with them. Such as, when I was 20 and full of piss and vinegar I suddenly moved out of my parents' place. I didn't have a car so I went to my Papaw and asked if he'd co-sign on a lease with me. He did better than that - he took money out against one of his own CD's to BUY the damn thing and I got to decide how low my monthly payments would be. It was one of the sweetest things anyone has ever done to help me spread my wings and pursue my own life.
The thing that bugs me is that Papaw is my mom's father and I have two other aunts to be concerned about. One of them is a 50 year old child who blows all her disability money at the casinos, the other made SUCH a scene at my Mamaw's funeral that I literally had to take her into another room to calm her down. I'm afraid they will either make this into a circus or make it about themselves - or both. My aunts have good qualities, after all they both came to my Grandmother's funeral in April, but they are loose cannons. I guess what I'm really looking for is some advice. I know some of you readers have lost people you care deeply about and I'm certain my heartache doesn't even compare to yours. Any words of comfort or advice on how to deal with the inevitability of death? I've already cried once today and am not sure how long I will feel this way. I am being faced with the realization that I am getting older and losing my family. It's not pleasant at all.