Dad's valve

Well, it looks like Dad will need surgery after all. He tried to convince the surgeon that he should wait and have it done in the fall, but the surgeon thought he should have it done sooner rather than later. It will probably be done in the few weeks.
I don't know how to react or act. I know it is the right thing to do. I was even more worried when they said they didn't want to do it, but I am still worried. I know all of the problems and complications that can happen. I know that most of the time patients do well, but this time it is my dad.
As far as how to act, I am unsure of that too. I know I should be strong for my Dad. But I worry that being strong will be misinterpreted as not caring. I feel like the best thing I can do is give information, but I don't want to give too much and scare him. I feel like if I get worked up it will just make things worse, but how do I show him that I care? How do I let him know I am concerned.
Selfishly, I want them to wait until I get back from Maui to do his surgery. I really want to be there. Jurgen suggested that I call the surgeon and make that suggestion, but I don't want to seem pushy.
This is hard. As you grow up you don't think about the fact that your parents are aging too. You just see them as the same as they were when you were 13 years old. Then, one day you notice that they are not that person anymore. You are not that person anymore. It is good, you have both grown. But, then you notice age setting in and the problems inherent in that - hypertension, diabetes, heart problems. You can't imagine not having them in your life, not being there with you every step of the way, holding your hand and cheering them on. Someday, however, we all have to face that. That too, is part of growing up.
I am just not ready to be that grown up.