help to sort out

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my friend rohan is suffering from homopsititisis or something like that. He has been reported to have low stability of his bone marrow. So he has decided to replace it. Exact match came from his real sister. Shez 6 yrs old . Docs said that the girl has low resistance to the narrowing of bone marrow. So it is becomming a big issue whether or not they shd transplant??.. Plz help them out!!!...