Make sure he keeps up on the mouth wash and also the stretches. It really helped me. I did lose the ability to whistle (temporarily but coming back) but otherwise it was not nearly as bad as I had imagined.
Also let him know not to stress over the catheter removal. I was terrified at that and it was a non-event. It was over so quick that I barely felt it. I had a wonderful RN that explained everything and had me take a couple inhales and exhales and then it was out. It was like a million pound weight off my shoulders.
Last I bet the first time he goes normal, he will be as excited as a schoolboy! I woke my wife up at 4:00am to tell her that I had to take a step back from the toilet to keep from missing! 🙂 I still smile a little each time in amazement at the pressure.
Sounds like you had a wonderful thing to be thankful about this year! I know I did.