Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.2936

Sec. 2936. (1) Proof. Whenever it is necessary to probate in this state, the last will of any deceased person which was either

(2) Legal representative's bill of peace. Whenever any person appointed by a probate court as the legal representative or trustee of the estate of a deceased person, a minor, or a mentally incompetent person, has possession of over $100.00-worth of the estate's real or personal property or its proceeds and has good reason to doubt his right to hold or dispose of this property because of adverse claims of title or lien of other persons or corporations, or of conflicting proceedings to administer the estate in that or another probate court, and no proceedings have been taken to test his right, by adverse claimants or otherwise, he may file a complaint in the nature of a bill of peace in the circuit court of the county in which is located the probate court which appointed him, to have adjudicated the validity of his own right and the rights of adverse claimants and the legal representatives appointed in conflicting proceedings.