Ohio Rev. Code § 3109.54: Signatures - notarization.

A power of attorney created pursuant to section 3109.52 of the Revised Code must be signed by the parent, guardian, or custodian granting it and by the grandparent designated as the attorney in fact. For the power of attorney to be effective, the signatures must be notarized. The child's social security number need not appear on the power of attorney for the power of attorney to be effective.