Ohio Rev. Code Ann. § 2109.16

When a person is appointed guardian of several minors who are children of the same parentage and inherit from the same estate, separate bonds shall not be required. In such cases, only one application for letters of guardianship is necessary, and the letters issued to such guardian shall be in one copy and not one copy for each minor. The probate court approving and recording the bond of the guardian, if any, and issuing such letters shall charge the fees allowed by section 2101.16 of the Revised Code for such services. Such fees shall be charged but once for all the wards and not once for each ward.