>>7298708It depends whether he wants an uplifting read, or some kind of philosophical essay, the kind of essay after which you could say: Ok, now I know almost everything I should know.
I would say, for the first case, even if that may seem out of place , sci-fi , autobiographies or history might be a good choice: seeing the long-term progress of humankind is somewhat uplifting, and the depth of the universe described may absorb him enough to alleviate pain and boredom.
Examples would be the Foundation series or C.G.'s Jung biography.
For philosophical essays, if he had an "analytical" mind, I would recommend Wittgenstein's Tractatus, as it's one of the few books that clearly delimitate how many knowledge we can get, and quotes like (6.4311),(6.52) ,and (6.521), and more generally the sixth and seven part, may help him to accept death.
If he's more of a literary kind, I don't know, but existentialist philosophy, although depressing, deals with this kind of problems.
And if he's religious, there's still the Bible, it fits in all these categories.
But, as all other anons said, the best is to spend time with your dad, and perhaps , if his condition permits it, to travel a bit (it could perhaps be bad for his physical health, but I would , if I was him, rather die abroad, in a country I always wanted to go to,rather than die in a gloomy hospital room.)
