Indiana Code Title 30. Trusts and Fiduciaries § 30-4-3-21

Sec. 21. (Remedies of the Beneficiary against Third Persons)

If the trustee has a claim against a third person for which he may maintain a civil action under 30-4-3-15 but he is unable, unwilling or neglects to commence the action within a reasonable time not to exceed thirty (30) days after written demand, any beneficiary may commence the action in his own right for the benefit of all the beneficiaries.