Wis. Stat. § 861.43: Authority and powers of conservator, guardian or agent.

A conservator, guardian or guardian ad litem of the spouse or of a child of the decedent, or an agent of the spouse or of a child of the decedent acting under a power of attorney, may on behalf of the spouse or child exercise any of the rights, apply for any of the allowances or make any of the selections that apply to the spouse or child under this subchapter.