This document is an affidavit providing consent for a minor child's participation in school sports events. This is an article that outlines how to fill out the forms but let's just do it together.This guide includes forms and instructions for a letter and affidavit to request that the court register an outofstate custody order in Texas. A financial disclosure affidavit is an official document describing a person's income (how much you make) and expenses (how you spend it).