Michigan Compiled Laws, Chapter 490. Credit Unions § 490.62

Sec. 12. Any account payable to a trustee for another person may be paid on demand to the trustee. Unless the credit union has received written notice of the terms of any trust other than the form of the account, payment may be made to the personal representative or heirs of a deceased trustee if proof of death is presented to the credit union showing that his decedent was the survivor of all other persons named on the account either as trustee or beneficiary; and payment may be made, on demand, to the beneficiary upon presentation to the credit union of proof of death showing that the beneficiary or beneficiaries survived all persons named as trustees.