Fundamental Requirements and Provisions Relating to Wills · Will Requirements
A written will does not need to meet the requirements of Section 251.051 if the will is executed in compliance with:
(1) the law of the state or foreign country where the will was executed, as that law existed at the time of the will's execution; or
(2) the law of the state or foreign country where the testator was domiciled or had a place of residence, as that law existed at the time of the will's execution or at the time of the testator's death.
Official text of the Texas Estates Code as published by the Texas Legislative Council.