Texas Family Code - FAM § 102.006. Limitations on Standing

(a) Except as provided by Subsections (b) and (c), if the parent-child relationship between the child and every living parent of the child has been terminated, an original suit may not be filed by:

(b) The limitations on filing suit imposed by this section do not apply to a person who:

(c) The limitations on filing suit imposed by this section do not apply to an adult sibling of the child, a grandparent of the child, an aunt who is a sister of a parent of the child, or an uncle who is a brother of a parent of the child if the adult sibling, grandparent, aunt, or uncle files an original suit or a suit for modification requesting managing conservatorship of the child not later than the 90th day after the date the parent-child relationship between the child and the parent is terminated in a suit filed by the Department of Family and Protective Services requesting the termination of the parent-child relationship.