An affidavit is a sworn statement of fact that can be used in a variety of legal proceedings, from bankruptcy cases to family and civil litigation matters. An affidavit of marriage is a legal document and a sworn statement submitted to the court or another institution, to verify that two people are married.An affidavit is more than just a legal document; it's a sworn statement that holds significant weight in the eyes of the law. An affidavit is the written equivalent of verballygiven court testimony. An affidavit is a sworn statement that is documented in writing. Affidavits are usually utilized in court proceedings or in negotiations. An affidavit is essentially a written statement from someone who knows you and can vouch for the validity of your marriage. A written statement that someone makes after promising officially to tell the truth. An affidavit can be used as proof in a law court. Next of kin is defined as a person's closest living relatives through blood or legal relationships.