My dad's wife and I were in 100% agreement on withdrawing treatment from dad...his step-daughter and daughter (my half-sister)? Notsomuch. We prevailed after much compassionate, but realistic, discussion.
After we made the decision, my dad's doctor took Pat and I aside and said, "I only pray to God that when my time comes, I have someone at my side to make the same tough decision you did." It meant the world to both of us.
We'd met with a team of doctors (w/the family) and each had their take...we heard them all out -- all optimistic as all get-out. His family doctor, who knew him, said little. (The others had never met my dad...never saw his life struggles...never knew his mind.) I finally asked him, "If it were your dad, Doctor, what would you do?" He said:
"It was my dad. Two years ago, my father spent six months in intensive care...on dialysis...one infection after another...on breathing support (which my dad was on, btw, I forgot to mention that). I wanted to end his suffering. The rest of my family did not. He lived for six months -- a horrible existence -- and then he died. If I had my way? He would have gone into hospice care shortly after he arrived. He was never going to leave the hospital."