Washington Summons: Notice about Petition to Change a Parenting Plan, Residential Schedule or Custody Order is a legal document issued by the court in order to notify one or both parents that a petition has been filed by either one of them, or by a third party, to change the existing parenting plan, residential schedule or custody order. This document includes the court case number, the names of the petitioner and respondent, the petitioner's address, the date the petition was filed, and the date and time of the hearing. There are two types of Washington Summons: Notice about Petition to Change a Parenting Plan, Residential Schedule or Custody Order: 1. Summons for Change of Parenting Plan, Residential Schedule or Custody Order 2. Summons for Parenting Plan, Residential Schedule or Custody Order Contempt.