Completing and signing Form I-864 makes you the sponsor. Much confusion surrounds the need to submit I751 affidavits and how to write them.We explain and provide an I-751 affidavit sample. An I130 affidavit is a written statement from friends, family members, or associates who can attest to the genuine nature of your marriage. To start the declaration, the person should state their complete name and address, as well as their country of citizenship.