Hey,
I dont have black fan diamond, but I know what it is. I got a rare anemia called pyruvate kinase deficiency.
Can you tell us something about your son's treatment. I know a few Dutch persons with bfd. If you like, I can ask them to contact you. I think they would like to tell you something about their treatment. (I am not sure of they speak all English, but I will ask)
p.s. This a great site! I have learn a lot of new things since I join them this autumn.