Texas Family Code - FAM § 160.510. Identical Brothers

(a) The court may order genetic testing of a brother of a man identified as the father of a child if the man is commonly believed to have an identical brother and evidence suggests that the brother may be the genetic father of the child.

(b) If each brother satisfies the requirements of Section 160.505 for being the identified father of the child and there is not another identical brother being identified as the father of the child, the court may rely on nongenetic evidence to adjudicate which brother is the father of the child.