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). Examples of acceptable residency documents include: Current, unexpired PA driver's license or photo ID card.PA vehicle registration card. On Form I864, petitioners must prove that they have the ability to financially support the visa applicant(s) if necessary. Use our Affidavit of Domicile form to verify the last home address of a deceased person to speed up the inheritance process. Form 6166 is a letter printed on US Department of Treasury stationery certifying that the individuals or entities listed are residents of the United States.