We're real sorry to hear this news as well Greg.
We will continue to keep you, your family, and your father in our prayers that he will not suffer, but will have enjoyable, painless last days with his family.
When my father passed away last spring, he was at peace with the Lord and felt no pain (the doctors couldn't understand the "no pain"). Dad passed away with a smile on his face and peacefully, knowing he was loved by his family and that he would be with the Lord. When it's your dads time, I hope it goes as smoothly, peacefully, and painlessly as my dad went.
Steven, Terry, and Family
(8 months later and it's still hard to talk/think about! I'm happy for him, but I miss him!
)