Michigan Compiled Laws, Chapter 700. Estates and Protected Individuals Code § 700.7305

Sec. 7305.(1) If the court determines that an interest is not represented under this part, or that the otherwise available representation might be inadequate, the court may appoint a guardian ad litem to receive notice, give consent, and otherwise represent, bind, and act on behalf of a minor, incapacitated, or unborn individual, or a person whose identity or location is unknown. A guardian ad litem may be appointed to represent several persons or interests.

(2) A guardian ad litem may act on behalf of the individual represented with respect to any matter arising under this article, whether or not a judicial proceeding concerning the trust is pending.

(3) In making decisions, a guardian ad litem may consider the general benefit accruing to the living members of the individual's family.