A personal representative or curator desiring to resign his or her trust, may file his or her petition for that purpose in the county commission of the county in which he or she was appointed, stating the names of all persons, so far as known by him or her, interested in the estate in his or her hands or under his or her control, and to which his or her duties as fiduciary relate, and if any of them are under disability, or nonresidents of the state; or if there are persons interested in the estate whose names are unknown, all of these facts, and the names of the guardians and committees of the persons under disability, if there are guardians or committees, shall be stated in the petition. Upon the filing of the petition the clerk of the court shall issue a summons against all the persons so named and the guardians and the committees of those under disability, if they have any, and against “the unknown parties in interest”, if any there are, mentioned in the petition, to appear before the court on a day to be named in the summons, which day may be not less than thirty days from the filing of the petition, and answer the petition, and state to the court the reasons, if any they have, why the petition should not be granted. If any of the persons interested reside in another county in this state, the summons as to them shall be directed and sent by mail by the clerk to the sheriff of that county to be served and returned by him or her; and as to the persons named in the petition who reside out of this state, or who cannot by the use of due diligence be found, and as to the unknown parties, an order of publication shall be awarded against them, which shall be published or posted and published, as in cases of appointment and qualification of personal representatives.