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So you want to prove that the petitioner is domiciled in the U.S., when the petitioner is actually not domiciled in the U.S.? That is not something I would recommend because it sounds like you want to prove something that is not true. Be careful of what you present to USCIS in this regard; fraud can have future prejudicial repercussions for you and the petitioner. You and the petitioner should talk to a U.S. immigration lawyer to explore your options.