Wyo. Stat. § 2-3-132: Petition for revocation by prior claimant; generally.

When letters of administration are granted to any person other than the surviving husband or wife, child, father, mother, brother or sister of the intestate, any one (1) of them who is competent, or any competent person at the written request of any one (1) of them, may obtain the revocation of the letters and be entitled to administration by presenting to the court a petition so praying.