Mother died of liver cancer after fighting off cancer 8 other times. She lived with me and I was her primary caregiver for the last 10 years of her life. We knew that death was ever only a heartbeat away, so we took care of a lot of things before hand. Made sure all of her accounts were TOD, made sure the deed to the home was in my name and that she was off of the mortgage. Took my name off of all of her credit cards. Essentially made sure that there would be no need to file an estate at all. And then, as others have been said, we lived like she was dying. We went places when we could, did things as often as we could. Mom recorded things, wrote letters, painted...tried to leave a legacy.
I bust your chops in the football thread, dude, but I'm sincerely sorry to hear about your fathers diagnosis. I'll be thinking good thoughts for you guys, and when the time comes, I hope it goes easy.