Tennessee Code Title 35. Fiduciaries and Trust Estates § 35-15-604

(a) A person may commence a judicial proceeding to contest the validity of a trust that was revocable immediately preceding the settlor's death within the earlier of:

(b) Upon the death of the settlor of a trust that was revocable immediately preceding the settlor's death, the trustee may proceed to distribute the trust property in accordance with the terms of the trust. Except as provided in § 35-15-817, the trustee is subject to liability for making the distribution only if at the time of the distribution:

(c) In the event a trust or trust provision is adjudged to be invalid, or if a distribution is adjudged to have been made in error, by the final judgment of the court having jurisdiction, which judgment is subject to no further appeal, any beneficiary having received an improper distribution shall, upon receipt of a copy of such order, return the improper distribution to the court. If the beneficiary fails to return the improper distribution to the court, the beneficiary is liable for costs, including reasonable attorney's fees, incurred to recover the improper distribution from the beneficiary.