Mich. Comp. Laws § 558.6: Dower in lands released by payment of mortgage.

Sec. 6.

If, in either of the cases above specified, the heir or other person claiming under the husband, shall pay and satisfy the mortgage, the amount so paid shall be deducted from the value of the land, and the widow shall have set out to her, for her dower in the mortgaged lands, the value of 1/3 of the residue after such deduction.