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). If you're planning to petition a family member for a green card, you'll most likely need to prepare Form I864, Affidavit of Support.If you hold a Virginia driver's license or photo identification. Download a proof of residency letter template for family members, notarized or non-notarized, tailored for legal use. Document(s) submitted as proof of identity must show your full legal name and date of birth. Learn how to prove your U.S. domicile for a family visa with our stepbystep guide. Essential documents and tips to ensure visa approval. Bring valid evidence that the applicant has immediate family in the area.