Mich. Comp. Laws § 105.5

Sec. 5. Upon receiving such petition it shall be the duty of the said probate court to issue a summons against the respondents named in such petition, stating briefly the object of said petition, and commanding them, in the name of the people of the state of Michigan, to appear before said probate court at a time and place to be named in said summons, not less than 20 nor more than 40 days from the date of the same, and show cause, if any they have, why the prayer of said petition should not be granted.