Mich. Comp. Laws § 490.356: Minor; deposit, investment, or withdrawal.

Sec. 356.

A domestic credit union may issue shares to and receive deposits from a minor. The minor may withdraw the deposits or shares and any dividends or interest on the deposits or shares. A deposit, investment in a share, or withdrawal under this section by a minor is valid and enforceable and the minor is considered an adult with respect to that deposit, investment, or withdrawal.