Mich. Comp. Laws § 552.4: Marriage of doubtful validity; procedure to affirm.

Sec. 4.

When the validity of any marriage shall be denied or doubted by either of the parties, the other party may file a bill or petition in the manner aforesaid, for affirming the marriage; and upon due proof of the validity thereof, it shall be declared valid by a decree or sentence of the court; and such decree, unless reversed on appeal, shall be conclusive upon all persons concerned.