A person other than a bank or trust company, or the Executive Secretary of the State Veterans' Board acting under an appointment in that capacity pursuant to subdivision 3105(a)(3) of this title, shall not be guardian of more than five wards at one time, unless all the wards are members of one family. Upon presentation of a petition by an attorney of the Veterans' Administration or other interested person, alleging that a guardian is acting in a fiduciary capacity for more than five wards as herein provided and requesting his discharge for that reason, the court, upon proof substantiating the petition, shall require a final accounting forthwith from such guardian and shall discharge him or her from guardianships in excess of five and forthwith appoint a successor.