I cannot speak for Texas law, but here in CA, while in individual can get power of attorney for another, it doesn't help them in family court because in court, the court will not allow a person without a license to practice law, speak on another's behalf. So when someone is pro per, they must speak for themselves. Power of attorney here only allows a limited amount of "power". Here, you would need a license to practice law, to represent a person before the court.