Wyo. Stat. § 1-32-302: Requisites of petition; parties.

The petition shall contain a description of the estate to be sold, a clear statement of the interest of the plaintiff, and a copy of the will, deed or other instrument of writing by which the estate is created. All persons in being who are interested in the estate or who may by the terms of the will, deed or other instrument creating the estate become interested as heir, reversioner or otherwise, shall be made parties to the petition. If the name or residence of any person who ought to be made a party is unknown to the plaintiff, the fact shall be verified by the affidavit of the plaintiff and the sale may be ordered notwithstanding such names and residences are unknown.