Tex. R. Civ. P. 36
As amended through August 27, 2024
In suits by the State upon the official bond of a State officer, any subordinate officer who has given bond, payable either to the State or such superior officer, to cover all or part of the default sued for, together with the sureties on his official bond, may be joined as defendants with such superior officer and his bondsmen whenever it is alleged in the petition that both of such officers are liable for the money sued for.
Tex. R. Civ. P. 36