God Bless him, and you and your family. My father died at 61, and my wifes mother, at 60. Both within the last couple of years, and because of cancer. Way too young. We miss them both terribly. During these times, its amazing how much clarity one can gain about what in life truly matters, and how much of what we stress over daily is crap. Hug your family, tell them you love them, and do something un-ordinary with them. Everything else we surround ourselves with daily means nothing if you stop and look at it.
By the way, for every heartache we must endure through cancer, and other ruthless diseases our families are stricken with, there are also many wonderful stories of people who beat the odds, reminding us to never give up. Its also God's way of telling us, to get our heads out of our ass and be thankful for all the things we take for granted every day... God Bless your Dad !