Wis. Stat. § 701.0415

The court may reform the terms of a trust, even if unambiguous, to conform the terms to the settlor’s intention if it is proved by clear and convincing evidence what the settlor’s intention was and that the terms of the trust were affected by a mistake of fact or law, whether in expression or inducement. A party petitioning the court for action under this section shall give notice of the proceeding to the settlor, if living, the trustee, each trust protector, each directing party, and the qualified beneficiaries.