Every time I was presented with a decision such as this I always asked the doctor. What would you do if it were your Dad or yourself? I would hope that he would answer honestly. If your dad is otherwise in good health, then go for it. As the poster above said, things can go wrong, but if you don't get help they are going wrong anyway. And at his age surgery of any kind will be very dangerous. Its a tough decision, but I agree your dad has to make it. You will be in my thoughts and prayers. God Bless you.