If not submitted to NVC along with the Affidavit of Support form, the petitioner will need to provide the visa applicant with evidence of his or her domicile. If you want to sponsor someone for a family-based green card, you need to provide proof of a U.S. domicile in your Affidavit of Support (Form I-864).This guide will clarify what domicile is, how to establish it, and the documentation you need for proof of domicile. This guide will explain how to prove domicile when filling out Form I-864 ("Affidavit of Support"). Consular processing support without the high price tag. Proof of U.S. domicile is required for the I864. Learn examples of proof of domicile along with proof of domicile documents required. Typically, in order to claim US domicile, the Affidavit of Support sponsor must be residing in the United States. They believe there are opportunities for the agricultural and conservation communities to work closer together and they look forward to more.