Kammie,I can't believe that your doctor would suggest your son to be a donor. It would be cruel to put someone through surgery that they really don't understand.
Kammie, my son was tested for Fragile X when he was very young, but his final diagnosis was high-functioning autism. He is 20 years old, and I am not sure how well he will be able to live independently. My biggest worry is what will happen to him when his dad and I are both gone. All parents of disabled children have this as their chief worry. The last thing I could ever do is to saddle my son with a potential health problem that might crop up involving his kidneys, exacerbated by the fact that he only had one, so I could never accept a kidney from him. So, I do understand why you would say no to that option.