Waymon, so sorry to hear. Debbie, my better half is a hospice RN; take advantage of all that hospice offers, a good hospice can be a godsend to the family as well as your father, making him comfortable, therefore making your mom's life easier, accept their advice with an open mind. Debbie experiences too many families that surprisingly don't want the patient to have pain meds, because they don't want them to get addicted, etc to drugs like morphine. A good nurse can prescribe the right amount to take the edge off the pain, but not leave him doped up, making for a more pleasant time for all involved. She may even be able to get assistance for a few hours, just so that she can have a break. Don't be afraid to talk to his hospice team about what help is available for your parents. The more communication, the better.
I will keep your family in my thoughts and prayers, Keep us posted.
Ken