Completing and signing Form I-864 makes you the sponsor. Instead, you must complete and submit Form I-864. 1.The relative you are sponsoring is not the only person immigrating based upon the underlying visa petition. The court requires proof of service. The person who served the documents should fill out an affidavit of service. Three written and signed affidavits. For most immigrant visa applications, Affidavits and Contracts are submitted to the Department of State National Visa Center (NVC). The affiant is making a sworn statement that the provided address is their current place of residence. The main purpose of an affidavit is to provide a written, sworn statement of fact that can be used as evidence in a legal proceeding. NON-RESIDENT MARRIAGE LICENSE APPLICATION - AFFIDAVIT.