In a suit for modification between a parent and a nonparent, the nonparent:
(1) if required to overcome the presumption under Section 153.002(b), must overcome the presumption by clear and convincing evidence; and
(2) may not overcome the presumption under Section 153.002(b) on the basis of a prior order granting relief to the nonparent if the parent agreed to the prior order.
Official text of the Texas Family Code as published by the Texas Legislative Council.