Shikha,
Your question is very intriguing. A major mom would definitely have minor children. And when the transplant is from a minor, that is the result. The major becomes a minor as happened with our friend Melis when she got a BMT from her minor sister. There have been successful mother to child BMT's but it is still a rather new procedure and why it works is not really understood, as a mother cannot be as close a match as a sibling. There is speculation that it has something to do with the same reason a mother's body does not reject the fetus in the womb, even though one half of the genetic material is from the father and therefore foreign to the host (the mom). Dr Peter Sodani spoke about the mother to child transplants at the TIF conference in Dubai and noted that the outcome had been a success in curing 9 of 15 patients. It is still a very new procedure and the results may show a higher success rate in the future.
I have never heard of a child to mother transplant and don't know if there is any reason that it could not work. A major problem may be the age of the mom, as BMT's are usually done in younger patients and the success rate gets lower with older patients. I will be very interested in what response you get from Dr Hwang.
Great question Shikha!