Wis. Stat. § 244.16: Judicial relief.

(1) The following persons may petition the circuit court of the county where the principal is present or of the county of the principal’s legal residence to construe a power of attorney or review the agent’s conduct, and grant appropriate relief:

(a) The principal or the agent.

(b) A guardian, conservator, or other fiduciary acting for the principal.

(c) A person authorized to make health-care decisions for the principal.

(d) The principal’s spouse, parent, or descendant.

(e) The principal’s domestic partner.

(f) An individual who would qualify as a presumptive heir of the principal.

(g) A person named as a beneficiary to receive any property, benefit, or contractual right on the principal’s death or as a beneficiary of a trust created by or for the principal that has a financial interest in the principal’s estate.

(h) A governmental agency having regulatory authority to protect the welfare of the principal.

(i) The principal’s caregiver or another person that demonstrates sufficient interest in the principal’s welfare.

(j) A person asked to accept the power of attorney.

(2) Upon motion by the principal, the court shall dismiss a petition filed under this section, unless the court finds that the principal lacks capacity to revoke the agent’s authority or the power of attorney.