Much confusion surrounds the need to submit I751 affidavits and how to write them. We explain and provide an I-751 affidavit sample.1. Talk to the person immigrating to the US. The person for whom you write an affidavit should be someone you know very well. An I130 affidavit is a written statement from friends, family members, or associates who can attest to the genuine nature of your marriage. By signing Form I-864, you are agreeing to use your resources to support the intending immigrants named in this affidavit, if it becomes necessary. An affidavit or letter can be used to fill gaps, corroborate or support other evidence or explain shortcomings or weaknesses in a petition. Exhibits are documents that you attach to your Affidavit because they support what you have said in your Affidavit. Court Forms; Sample Forms; Assistance Filling Out Forms. Completed University of Michigan Affidavit of Financial Support; Bank statement(s) or funding letter; Copy of your passport, photo page only. The affidavit) and the format of an affidavit.