Ohio Revised Code Title LIII. Real Property § 5303.02

In actions to recover the purchase money of real estate by vendor against vendee, the vendee, notwithstanding his continued possession, may by way of counterclaim set up any breach of the covenants of title acquired by him from the plaintiff, and make any person claiming an adverse interest therein a party to the action. Upon the hearing, he may recoup against the plaintiff's demand the present worth of any existing lien or encumbrance thereon. If the adverse interest of the claimant is an estate in reversion or remainder, or contingent upon a future event, with his assent, the court of common pleas may order the vendee to surrender possession to his vendor upon the repayment of so much of the purchase money as has been paid, with interest, or direct the payment of the purchase money claimed in the action, upon the plaintiff's giving bond in double its amount with two or more sureties to be approved by the court, for the payment thereof with interest, if by reason of the defect the defendant or his privies are subsequently evicted.