Mich. Comp. Laws § 453.3

Sec. 3. Such articles of association shall have indorsed thereon, or annexed thereto, an affidavit made by not less than 3 of the signers thereof, sworn to before some officer in this state authorized to administer oaths, showing that the persons whose names are signed to said articles of association are members of the state grange of the patrons of husbandry, and that they have been appointed by the executive committee of said state grange to make and execute said articles for the purpose of incorporating a state grange, as aforesaid, and that such articles of association are made and executed in accordance with the direction of said executive committee.