Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.1913

(a) upon an individual nonresident defendant having any of the contacts, ties or relations with this state as specified in chapter 7 of this act,  1 by service of a summons and a copy of the complaint upon such agent, employee, representative, salesman or servant of the defendant as may be found within the state, and by sending a summons and a copy of the complaint by registered mail addressed to the defendant at his last known address.

(b) upon an infant defendant, by leaving a summons and a copy of the complaint with a person having the care and control of him with whom he resides, or with his legal guardian, or

(c) upon a defendant who has been judicially declared incompetent and for whom a guardian has been appointed and is acting, by leaving a summons and a copy of the complaint with the guardian.