Ownership of property in the US (has both our names on it). Purpose: To request domicile verification from a nonrelative who is familiar with the household's situation.Providing proof of domicile in the United States is critical for most people when submitting Form I864, Affidavit of Support. Specifically, I was reading that the Montreal Consulate (which is the one we'll be going through) is really stringent on proving domicile. There are five stages for application submission. 1. This guide will explain how to prove domicile when filling out Form I-864 ("Affidavit of Support"). Consular processing support without the high price tag.