755 ILCS 5/10-2
A person desiring to have letters of administration to collect issued on the estate of a deceased or missing person must file a petition therefor in the court of the proper county. The petition must state, if known: (a) the name and place of residence of the decedent at the time of his death or the name and last known address of the missing person; (b) the time and place of the decedent's death or in the case of a missing person the facts and circumstances as to his being missing or reported as missing or missing in action; (c) the approximate value of the decedent's or missing person's real and personal estate in this State and the amount of his anticipated gross annual income from his real estate in this State; (d) in the case of a missing person, the names and post office addresses of his nearest relatives in the following order: the spouse and adult children, if any; if none, the parents and adult brothers and sisters, if any; if none, the nearest adult kindred; (e) the name and address of the person proposed as administrator to collect; and (f) the reason for the issuance of letters.
755 ILCS 5/10-2