Missouri Revised Statutes Title XXXI. Trusts and Estates of Decedents and Persons Under Disability § 472.080. Documents filed with court, form--content

1. Except as otherwise specifically provided in this code or by supreme court rule, every document filed with the court under this code, including but not limited to applications, petitions, claims, and demands for notice, shall be signed by or on behalf of the petitioner or claimant, and shall contain a statement that it is made under oath or affirmation and that its representations are true and correct to the best knowledge and belief of the person signing same, subject to the penalties of making a false affidavit or declaration.

2. No defect of form or substance in any document invalidates any proceedings after judgment on the document.