Did you get an RFE ? The address entered on the I-864 should be sufficient.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). Purpose: To request domicile verification from a nonrelative who is familiar with the household's situation. A tax return or transcript is a good way to establish domicile. This guide will clarify what domicile is, how to establish it, and the documentation you need for proof of domicile.