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). What legal identification is required?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 domicile occurs at the NVC , if filing stateside, or at the CONSULATE if a DCF is accepted. March 2, 2018 Married In Hong Kong. Part of the process requires the sponsoring spouse to provide proof of intent to domicile in the US with the immigrating applicant. This guide will clarify what domicile is, how to establish it, and the documentation you need for proof of domicile.