Hey Art,
I'm so sorry to hear of your granddads illness. I know what you're going through as I watched my father succumb to emphysema. My dad was a goer and a doer and this disease pretty much robbed him of anything that resembled his real life. I think he hung on mostly for mom who at the end developed lung cancer that had spread. They died within 3 months of each other in 2001. He was 81 and she was 79.
Your grandfather is very lucky to have such a loving family to support him through such a difficult time. My thoughts are with you and yours.
PS.. my dads name was Art.