Michigan Compiled Laws, Chapter 700. Estates and Protected Individuals Code § 700.2908

Sec. 2908. (1) If a disclaimed interest arises out of joint property created by a governing instrument, testamentary or nontestamentary, the following apply:

(2) If the donee of a power of appointment or other power not held in a fiduciary capacity disclaims the power, all of the following apply:

(3) If all incumbent trustees disclaim a disclaimable interest, and the governing instrument does not provide for another disposition of the disclaimed interest if it is disclaimed or for another disposition of disclaimed or failed interests in general, then the disclaimed interest devolves as if the trust with respect to which the disclaimer was made never existed. If less than all incumbent trustees disclaim a disclaimable interest and the governing instrument does not provide for another disposition of the disclaimed interest under those circumstances, then the trustee who disclaims is treated as never having had any interest in or power over the disclaimed interest.

(4) If a fiduciary disclaims a fiduciary power, the fiduciary power ceases to exist as of the effective date of the disclaimer. A disclaimer of a fiduciary power by 1 of multiple incumbent fiduciaries is binding only on the fiduciary who disclaims and is not binding on the other incumbent fiduciaries or on successor fiduciaries. A disclaimer of a fiduciary power by all incumbent fiduciaries is binding on all successor fiduciaries, unless the disclaimer states otherwise.