Mich. Comp. Laws § 565.602

Sec. 2. All deeds of lands situated in this state, heretofore or hereafter made by any married woman jointly with her husband by their attorney in fact, under a joint power of attorney, executed and acknowledged as required in the joint deed of a husband and wife, and recorded in the office of the register of deeds of the proper county, shall be taken and deemed as between the parties thereto, and all persons claiming under or through them as valid and effectual to convey the legal title of the premises therein described, as if the same had been executed and acknowledged by the husband and wife in person.