Petition for Joinder

Sacramento Superior Court

Verified current as of June 9, 2026

This form is used to ask a court to add another person as a party to an existing case, typically when that person has a direct interest in the outcome or when their involvement is necessary for a fair resolution. A person would use this form if they believe they should be included in a lawsuit that's already been filed, such as a co-parent wanting to join a custody case or a property co-owner wanting to participate in a dispute.