Tennessee Code Title 67. Taxes and Licenses § 67-5-2405

(b)(1) The complaint shall be in substance and form as other complaints for the enforcement of liens and may be filed against and contain the names of all the delinquent taxpayers in the county, and the fact that the complaint contains the names of more than one (1) defendant shall not be considered by the court multifarious, or a misjoinder of parties.

(2) Additional defendants and delinquent taxes may be added to the suit as a matter of right upon the filing of a notice on behalf of the complainant to add additional defendants and without the necessity of amending the complaint. Upon the filing of such notice, the additional defendants shall be served with process pursuant to the Rules of Civil Procedure and § 67-5-2415.

(e)(1) If a plaintiff has reasonable cause to believe that an interested person owning an interest in a parcel is a minor or a person who is incompetent and that the person has no spouse, parent, child, guardian or best friend suitable to represent the person's interest, nor any appointed representative, the plaintiff shall make that fact known to the court. The court shall determine whether the interests of justice require the appointment of a guardian ad litem or attorney ad litem to represent the interests of the person. Otherwise, notice to such spouse, parent, child, guardian, best friend, or appointed representative, shall constitute notice to the interested person.

(2) It is not necessary for unborn, unfound or unknown owners to have a guardian ad litem, attorney ad litem, or other representative, appointed to represent their interests in the proceedings except as provided in subdivision (e)(1).