Ohio Revised Code Title LVIII. Trusts § 5817.09

(1) The lack of testamentary intent or the intent to create a trust, as the case may be;

(2) The lack of the testator's testamentary capacity, or the settlor's legal capacity to enter into and establish the trust;

(3) Undue influence, restraint, or duress on the testator or settlor;

(4) Fraud or mistake in the execution of the will or trust;

(5) Revocation of the will or trust.