Section 755 ILCS 5/20-5 - Procedure for sale or mortgage of real estate(a) Before selling or mortgaging real estate, the representative shall file a petition in the court which issued his letters setting forth the facts and circumstances upon which it is founded, a description of the real estate or interest therein, or of the oil, gas, coal or other mineral interest involved, the approximate value thereof, the interest of the ward or decedent therein, and the nature and extent of all liens upon and other interests, if any, in the real estate, or in the oil, gas, coal or other mineral interest so far as they may be known to the petitioner. A copy of the proposed mortgage or of the proposed contract for sale of the real estate, if any, shall be attached to the petition.(b) All persons holding liens against or having an interest in the real estate, or in the oil, gas, coal or other mineral interest or in any part thereof, described in the petition, in possession or otherwise, whose rights are sought to be affected by the order, except the ward shall be made parties defendant.(c) Upon the filing of the petition, process shall be issued, served and returned as in other civil cases.(d) The court shall appoint a guardian ad litem for any party to the proceeding who is a ward and who is not represented by a guardian. If it appears that any person not in being upon coming into being is or may become or may claim to be entitled to any interest in the property sought to be sold or mortgaged, the court shall appoint some competent and disinterested person as guardian ad litem to appear for and represent such interest in the proceeding and to defend the proceeding on behalf of the person not in being, and any judgment or order rendered in the proceeding is as effectual for all purposes as though the person were in being and were a party to the proceeding.(e) On or before entry of an order authorizing a sale or mortgage under this Article, it is the duty of the petitioner to comply with the provisions of Section 12-9.