A written statement that someone makes after promising officially to tell the truth. An affidavit can be used as proof in a law court.An affidavit is a written statement that you swear is true and that may be used as evidence in a court of law. Both copies will be required in court. DECEDENTS, ESTATES AND FIDUCIARIES. Chapter. 1. Maryland law allows you to establish paternity through a court order or through an Affidavit of Parentage form. Affidavit: A written or printed statement made under oath. Amount in controversy: The amount of money at issue in a case. After the hearing, the court may order a default judgment in that amount.