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It is not clear whether you are the mother or grandmother! However, I advise you get advice from a specialist family lawyer. There should be no reason why a residence order cannot be overturned especially if you can prove that it is in the best interests of the child for the order to be reversed/changed.
I am sorry to hear about this. I can only repeat my advice namely that you really ought to get specialist advice from a family lawyer. From what you say there are good reasons why the residency order could be changed.