Positive thoughts and prayers for your son and his family. For what it's worth, see if there is a holistic doctor - like naturopath - or more holistic doctor like an osteopath in your area. They are a least more inclined to look beyond the symptoms to treat and get to the source. I will also if he is so inclined to send him/his family Reiki healing energy to support. Like a gift that one can choose to open, our higher selves can accept and receive it as needed.