Ohio Rev. Code Ann. § 2101.24
(A)
(1) Except as otherwise provided by law, the probate court has exclusive jurisdiction:
(2) In addition to the exclusive jurisdiction conferred upon the probate court by division (A)(1) of this section, the probate court shall have exclusive jurisdiction over a particular subject matter if both of the following apply:
(B)
(1) The probate court has concurrent jurisdiction with, and the same powers at law and in equity as, the general division of the court of common pleas to issue writs and orders, and to hear and determine actions as follows:
(c) Subject to section 2101.31 of the Revised Code, any action with respect to a probate estate, guardianship, trust, or post-death dispute that involves any of the following: