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).On Form I864, petitioners must prove that they have the ability to financially support the visa applicant(s) if necessary. This guide will clarify what domicile is, how to establish it, and the documentation you need for proof of domicile. The US petitioner must prove US domicile. Domicile to and have been a bona fide resident of the State of Florida since the____day of________,_____. You must submit all required items in ONE package to NVC. Your case may be significantly delayed if you don't submit all of your documents at the same time. The KEY is demonstrating your DEFINITE intentions to return to the US to reside there with the intending immigrant family member.