Texas courts are hesitant to give one parent 'full custody' because it is generally thought to be in the best interest of the child to have visitation and interaction with both parents. That being said you can go back to court and file a Suit Affecting the Parent Child Relationship and in that suit attempt to show how your ex is a bad influence and why he should not be allowed to visit with the child. At the same time you can ask the court to set child support. He will most likely be ordered to...