To change an existing child custody or visitation decree, you must prove that the change is in your child’s best interest and that at least one of the following has occurred:
There has been a material and substantial change in the circumstances of the child, a conservator, or another person affected by the original order
The child is at least 12 years-old and tells the judge who they want to live with
The person with primary custody has allowed someone else to have primary care and possession of the child for at least 6 months (does not apply to deployed active-duty military)