Wisconsin Statutes Probate (Ch. 851 to 882) § 851.21. Person interested

(a) An heir of the decedent.

(b) Except as provided in s. 853.32(2)(e), a beneficiary named in any document offered for probate as the will of the decedent and includes a person named or acting as a trustee of any trust, inter vivos or testamentary, named as a beneficiary.

(c) A beneficiary of a trust created under any document offered for probate as the will of the decedent.

(d) A person named as personal representative in any document offered for probate as the will of the decedent.

(e) Additional persons as the court by order includes as “interested persons”.

(a) An heir of the decedent who is not a beneficiary under the will of the decedent, upon admission of the will to probate under ch. 856 or entry of a statement of informal administration under ch. 865.

(b) A beneficiary named in documents offered for probate as the will of the decedent who is not an heir of the decedent, upon denial of probate to such documents.

(c) A person named as personal representative or testamentary trustee in the will of the decedent, upon the person's failure to be appointed, the denial of letters by the court, or upon the person's discharge.

(d) A beneficiary under the will of a decedent, upon full distribution to the beneficiary.

(e) A beneficiary of a trust created under documents offered for probate as the will of the decedent upon the admission of the decedent's will to probate and the court's appointment of the trustee.

(f) A parent who is barred from inheriting from his or her child's intestate estate under s. 852.14(3).