(a) A person named as guardian in a will who was not an adult when the will was probated is entitled to have letters of guardianship that were granted to another person revoked and appropriate letters granted to the named guardian on proof that the named guardian has become an adult and is not otherwise disqualified from serving as a guardian.
(b) This subsection applies only if a will names two or more persons as guardian. A person named as a guardian in the will who was a minor when the will was probated may, on becoming an adult, qualify and receive letters of guardianship if:
(1) letters have been issued to the named guardians in the will who are adults; and
(2) the person is not otherwise disqualified from receiving letters.
Official text of the Texas Estates Code as published by the Texas Legislative Council.