Granash, how awful, but take hope that progress in the treatment of pancreatic cancer will give him a bit longer than three months. I know two people who are now not suffering from this abysmal type of cancer. One was given three months two years ago, but has responded to chemo and is doing an 18 hole round of golf every week, travelling abroad for a week at a time. Obviously it takes its toll but she chunks life down into positive manageable time scales. the other is my daughter's DMiL, it is only 6 months ago that she got the diagnosis and has responded to treatment, did Christmas Lunch (with some help), talking about a holiday abroad and has given a normal life span. If it's two years then so be it, but hopefully 5.
Keep hoping and thinking positive. I can't help with books, but the previous posters have some good ideas, when the time comes for my DGCs to face this with their other gran then I shall refer back to GN.