Tenn. Code Ann. § 34-5-105: Limitation on number of wards

(a) No person, other than a bank or trust company, shall be guardian of more than twelve (12) wards at one time, unless all wards are members of one family.

(b) Upon presentation of a petition by an attorney of the department of veterans services or other interested person, alleging that a guardian is acting in a fiduciary capacity for more than twelve (12) wards as provided in subsection (a) and requesting the guardian's discharge for that reason, the court, upon proof substantiating the petition, shall require a final accounting forthwith from the guardian and shall discharge the guardian from guardianships in excess of twelve (12), after first having appointed a successor.