Hawk, I was walking in your shoes just about one month ago.
Be of good faith; the docs know what they're doing and the technology now is amazing!
Now my Dad is going strong, in rehab, working out and itching to walk farther and work out more on the machines. That's from 5 weeks ago, a time when my whole family experienced the nervousness and fear that your family undoubtedly is experiencing right now.
I'll put out the word to my entire family group. There were plenty of folks praying for my Dad when he went in; we'll be glad to pass it on.
Believe. And try not to worry; it doesn't help him or you. I know that's tough to do, but it's best to try.