Mich. Comp. Laws § 557.151
Evidence of indebtedness payable to husband and wife; ownership in joint tenancy.
All bonds, certificates of stock, mortgages, promissory notes, debentures, or other evidences of indebtedness hereafter made payable to persons who are husband and wife, or made payable to them as endorsees or assignees, or otherwise, shall be held by such husband and wife in joint tenancy unless otherwise therein expr…