Texas Family Code - FAM § 153.002. Best Interest of Child;  Rebuttable Presumption in Suit Between Parent and Nonparent

(a) The best interest of the child shall always be the primary consideration of the court in determining the issues of conservatorship and possession of and access to the child.

(b) In a suit between a parent and a nonparent, it is a rebuttable presumption that:

(c) In a suit between a parent and a nonparent, the nonparent may overcome the presumption under Subsection (b) by proving by clear and convincing evidence that denial of the relief requested by the nonparent would significantly impair the child's physical health or emotional development.  If the court renders an order in the suit granting relief to the nonparent, the court shall state in the order: