On Form I864, petitioners must prove that they have the ability to financially support the visa applicant(s) if necessary. 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).There are five stages for application submission. 1. Domicile: Candidates must be a resident of Maharashtra or have a valid domicile certificate. 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. Declaration: A formal statement confirming the applicant's residency in the state or union territory, including the duration of residence. This guide will clarify what domicile is, how to establish it, and the documentation you need for proof of domicile.