Texas Insurance Code - INS § 1201.062. Coverage for Certain Children in Individual or Group Policy or in Plan or Program

(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:

(b) Coverage for a grandchild of the insured or group member may not be terminated solely because the grandchild is no longer a dependent of the insured or group member for federal income tax purposes.