Ohio Rev. Code Ann. § 3111.27
(A) Except as provided in section 2151.232 or 3111.821 of the Revised Code, for an acknowledgment of paternity filed with the office of child support to be rescinded both of the following must occur:
(1) Not later than sixty days after the date of the latest signature on the acknowledgment, one of the persons who signed it must do both of the following: