Texas Estates Code - EST § 254.005. Forfeiture Clause

(a) A provision in a will that would cause a forfeiture of or void a devise or provision in favor of a person for bringing any court action, including contesting a will, is enforceable unless in a court action determining whether the forfeiture clause should be enforced, the person who brought the action contrary to the forfeiture clause establishes by a preponderance of the evidence that:

(b) This section is not intended to and does not repeal any law recognizing that forfeiture clauses generally will not be construed to prevent a beneficiary from seeking to compel a fiduciary to perform the fiduciary's duties, seeking redress against a fiduciary for a breach of the fiduciary's duties, or seeking a judicial construction of a will or trust.