Michigan Compiled Laws, Chapter 570. Liens § 570.421

Sec. 21. Any party complaining or defending may append to the complaint or answer, as the case may be, any pertinent interrogatories, or upon such motion or notice, the court may permit such interrogatories to be filed at any other time; and the personal answer to all such interrogatories shall be filed upon oath within the same time that pleadings are required to be filed, or as required by special order; and such answers so far as responsive, may be read as evidence by either party on the trial or hearing; and if either party shall refuse to answer to such interrogatories, the court shall make such order as to right shall appertain.