Completing and signing Form I-864 makes you the sponsor. Forms ; Complaint Verification.PDF ; Summons with Notice. Clearly state the purpose of the affidavit, including the case name, case number, and the reason why the affidavit is being submitted. After the Affidavit of Service is done, it must be filed with the Court. Affidavits usually need to be notarized or they are not affidavits, but in you case a statement might be enough. In your first paragraph, you must state your full legal name, address, birth date, and place of birth. An affidavit or letter can be used to fill gaps, corroborate or support other evidence or explain shortcomings or weaknesses in a petition.