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 explain how to prove domicile when filling out Form I-864 ("Affidavit of Support").Consular processing support without the high price tag. This guide will clarify what domicile is, how to establish it, and the documentation you need for proof of domicile. You have to submit at NVC, NVC's job is to collect the documents for the consulate and make sure they are complete. In this post, we'll explore examples of proof of US domicile and the documents required to establish proof of domicile.