Tennessee Code Title 20. Civil Procedure § 20-12-128

(a) The next friend or any person who has been appointed by any court guardian, guardian ad litem or conservator of any person adjudicated incompetent or infant, may commence and prosecute an action, suit or cross suit or appeal without giving bond or security for costs, by taking and subscribing an oath that the next friend, guardian, guardian ad litem or conservator has no property of the person adjudicated incompetent or infant, out of which to bear the expense of such action, and that the next friend, guardian, guardian ad litem or conservator verily believes that such person adjudicated incompetent or infant is justly entitled to the redress sought. The next friend or person may also file an accompanying affidavit of indigency as prescribed by court rule. The filing of such a civil action without paying the costs or taxes or giving security for the costs or taxes does not relieve the responsibility for the costs and taxes, but merely suspends their collection until taxed by the court.

(b) The guardian, guardian ad litem or conservator shall not incur any personal liability for such action, unless the court finds that the step was not taken in good faith.