Once a Texas court assumes authority over the best interest of a child, that court retains the right to make any future decision about the child until another court acquires the right to make such decisions. The court can change or modify the current child support order if the circumstances of the child or a person affected by the order have materially and substantially changed. Texas courts have identified several events that amount to a material and substantial change. Marriage to another person can be a material and substantial change. A change in residence, age, medical condition, employment, criminal history or the relationship between the parents making the current orders unworkable can be found by the court to be a material and substantial change.