At least he's lucky enough to have you there to be with him. I'm not so sure about this, but if I think about it, if my dad was struggling with life as I took care of him, I'd make sure to talk to him, and to tell him things that would make his mind pleased. Such as how much I love him, how important he has always been, and how he makes me want to be a better person, which I strive to do every day. You know, just things to ease the mind, because there is only so much you can do about the body. It's even worse if the drugs to ease the pain keep him "out of it" to where he cant really hear or understand. Just thinking about this... what you are going through, is a real tear jerker, I am sorry for what you are going through. Thankfully you are there for him. Stay strong brother.