I'm sorry that I somehow overlooked this thread for so long. I'm even more sorry to hear about what is going on. My best wishes and thoughts to you and your family.
I suspect we are alot alike -- I have a small circle of close friends, but mainly it's my immediate family that I'm close to. While I wasn't as close to my parents as you obviously are, dealing with their health issues years ago was very difficult and certainly brought starkly home that you should appreciate everything that you have now, because it can certainly change quickly on very short notice.
Again, my very best wishes and hopes for a speedy recovery for your old man.
Should I start some kind of history thread to take your mind off the worrying?