Not just your riding partner, but your flesh and blood. I can only imagine what you are going through.
Doctors can do some amazing things nowadays. I hope you have the best doctor and best hospital.
Is insurance covering it?
As far as the July ride, perhaps you can rent or borrow a trike and the two of you can pull it off. I hope so.
I am a cancer survivor myself and know the ordeal for what it truly is. If you would care to share your son's name and the address of the hospital I would love to send him a card and note of encouragement. I am sure there are others here that would do the same.