Tex. Ins. Code § 1201.062
(a) An individual or group accident and health insurance policy that is delivered, issued for delivery, or renewed in this state, including a policy issued by a corporation operating under Chapter 842, or a self-funded or self-insured welfare or benefit plan or program, to the extent that regulation of the plan or program is not preempted by federal law, that provides coverage for a child of an insured or group member, on payment of a premium, must provide coverage for:
(1) each grandchild of the insured or group member if the grandchild is:
Added by Acts 2003, 78th Leg., ch. 1274, Sec. 3, eff. April 1, 2005.
Acts 2015, 84th Leg., R.S., Ch. 1150 (S.B. 550), Sec. 57, eff. September 1, 2018.