Tenn. R. Civ. P. 13.08
As amended through January 18, 2024
When the presence of parties other than those to the original action is required for the granting of complete relief in the determination of a counterclaim or cross-claim, the court may order them to be brought in as defendants as provided in these rules, if jurisdiction of them can be obtained.
Tenn. R. Civ. P. 13.08