PROB §277: (a) A disclaimer on behalf of a minor shall be made by the guardian of the estate of the minor if one has been appointed or, if none has been appointed, by a guardian ad litem of the minor.

(a) A disclaimer on behalf of a minor shall be made by the guardian of the estate of the minor if one has been appointed or, if none has been appointed, by a guardian ad litem of the minor. A disclaimer by a guardian is not effective unless made pursuant to a court order obtained under this section. (b) A disclaimer on behalf of a decedent shall be made by the personal representative of the decedent. Except as provided in Part 6 (commencing with Section 10400) of Division 7, a disclaimer by a guardian or personal representative is not effective unless made pursuant to a court order obtained under this section. (c) A petition for an order authorizing or requiring a guardian or personal representative to execute and file a disclaimer shall be filed in the superior court in the county in which the estate of the minor or decedent is administered or, if there is no administration, the superior court in any county in which administration would be proper. The petition may be filed by the guardian, personal representative, or other interested person. (d) The petition shall: (1) Identify the creator of the interest. (2) Describe the interest to be disclaimed. (3) State the extent of the disclaimer. (4) Identify the person or persons the petitioner believes would take the interest in the event of the disclaimer. (e) Notice of the hearing on the petition shall be given as follows: (1) If the petition is for an order authorizing or requiring the guardian of the estate of a minor to execute and file the disclaimer, notice of the hearing on the petition shall be given for the period and in the manner provided in Chapter 3 (commencing with Section 1460) of Part 1 of Division 4 to all of the persons required to be given notice under that chapter. (2) If the petition is for an order authorizing or requiring the personal representative of a decedent to execute and file the disclaimer, notice of the hearing on the petition shall be given as provided in Section 1220. (3) If the petition is for an order authorizing or requiring a guardian ad litem of a minor to execute and file the disclaimer, notice of the hearing on the petition shall be given to the persons and in the manner that the court shall by order direct. (f) After hearing, the court in its discretion may make an order authorizing or requiring the guardian or personal representative to execute and file the disclaimer if the court determines, taking into consideration all of the relevant circumstances, that the minor or decedent as a prudent person would disclaim the interest if he or she had the capacity to do so.