Sorry hear this Bill.
I figure with the type of cancer he has and the stage it's in. It wouldn't be long. Just hope he goes peacefully. When my first wifey was doing chemo. It would beat her up for over a week. It's not fun to watch a loved one go thought it.
There is nothing you can do about it either. Your dad it not the the first one to try chemo and quit it. So please not blame him for not trying. Remember the good times you had with him. Those are the memories you will cherish the most. We will keep him in our prayer, along with your gramdma. If you need anything, even to let off steam. Let us know.