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). My residence or business address is: On (date):.I served the following documents (specify):. There are five stages for application submission. 1. Typically, in order to claim US domicile, the Affidavit of Support sponsor must be residing in the United States. Please submit your documents using only one of the following formats. Edit, sign, and share proof of domicile online. No need to install software, just go to DocHub, and sign up instantly and for free.