For tax purposes a resident of the USA ( green card holder ) is not a foreign person. You may have to amend the original filing. The best way would be to seek help from a tax professional or a tax attorney -- only because IRS has taken a position based on your filings and therefore would be reluctant to change. Also you could consider having the managing member of the LLC resign , induct his citizen spouse as the member and then she appoints the husband as her POA. But you really need to discuss this with an attorney.
