Relating to the determination of the best interest of the child and possession of or access to a child by a nonparent in certain suits affecting the parent-child relationship.

HB 5595 amends Texas Family Code sections to establish a legal presumption that parents act in their child's best interest and that children should remain with parents in custody disputes. It creates a rebuttable presumption favoring parents over nonparents (such as grandparents or caregivers) in cases involving possession or access to a child. Nonparents can challenge this presumption by proving with "clear and convincing evidence" that denying their request would significantly impair the child's physical health or emotional development. The bill also repeals several existing provisions related to nonparent custody rights and modifies how courts handle modifications to existing custody orders.