Mich. Comp. Laws § 490.63
Payment made pursuant to sections 10, 11 or 12 discharges the credit union from all claims for amounts so paid whether or not the payment is consistent with the beneficial ownership of the account as between parties, or beneficiaries, or their successors. The protection here given does not extend to payments made after a credit union has received written notice from any party who has a present right of withdrawal to the effect that withdrawals in accordance with the terms of the account should not be permitted. Unless the notice is withdrawn by the person giving it, the death of any party after notice has no effect on withdrawal rights, and the personal representative, or heirs, of the decedent must concur in any demand for withdrawal if the credit union is to be protected under this section. No other notice or any other information shown to have been available to a credit union shall affect its right to the protection provided here. The protection here provided shall have no bearing on the rights of parties in disputes between themselves or their successors concerning the beneficial ownership of funds in, or withdrawn from, multiple-party accounts.
MCL 490.63