Mich. Comp. Laws § 333.5539: Authority of family representative.

Sec. 5539.

The authority of a family representative to act as provided in this part is given first to the affected individual's legal guardian, and if none, then to his or her spouse, and if none, then to his or her adult child or children, and if none, then to his or her parent, and if none, then to other family members.