Michigan Compiled Laws, Chapter 700. Estates and Protected Individuals Code § 700.2907

Sec. 2907. (1) Except as otherwise provided in this section and section 2908,  1 if a disclaimed interest arises under a will or a trust created by will, or by the laws of intestacy, and the decedent has not provided for another disposition of that interest if it is disclaimed or for another disposition of disclaimed or failed interests in general, the disclaimed interest devolves as if the disclaimant had predeceased the decedent. However, if by law, or under the will or trust created by will, the descendants of the disclaimant would take the disclaimant's share by representation if the disclaimant predeceased the decedent, then the disclaimed interest passes by representation to the descendants of the disclaimant who survive the decedent.

(2) A future interest that takes effect in possession or enjoyment upon the termination of the disclaimed interest takes effect as if the disclaimant had predeceased the decedent. A future interest that is held by the disclaimant and that takes effect at a time certain is not accelerated and takes effect at the time certain.

(3) Except as otherwise provided in this section and section 2908, if the disclaimed interest arises under a governing instrument other than a will or trust created by will, and the governing instrument does not provide for another disposition of that interest if it is disclaimed or for another disposition of disclaimed or failed interests in general, the disclaimed interest devolves as if the disclaimant had died before the time when the interest was entitled to take effect in possession or enjoyment. However, if by law or under the governing instrument the descendants of the disclaimant would take the disclaimant's share by representation if the disclaimant predeceased the effective date of the instrument, then the disclaimed interest passes by representation to the descendants of the disclaimant who survive the effective date of the instrument.

(4) A future interest that takes effect in possession or enjoyment at or after the termination of the disclaimed interest takes effect as if the disclaimant had died before the time when the interest was entitled to take effect in possession or enjoyment. A future interest that is held by the disclaimant and that takes effect at a time certain is not accelerated and takes effect at the time certain.