I am sorry. But, I don't see this working.
She got the G-5 because her employer 'qualified' as being part of an international organization: http://travel.state.gov/visa/temp/types/types_2638.html
There is no 'transfer' possible.
Go ahead and meet with an attorney ... for confirmation that this won't work.
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G Visas in general are dependent upon a Governmental sponsorship. Since it appears that your brother is not part of a governmental "transfer" of G status is not possible under these circumstances.
Won't work. That G-5 visa was specific to her employer and is not transferable.
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I agree with the other attorneys and want to add that, while she cannot work for your brother on the same G-5 visa, there may be other options for your brothers to keep her here. Consult with an experienced immigration attorney.
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You may be able to file a B category visa for temporary domestic staff if your brother is traveling internationally and needs help.
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