Legal Aid of North Texas provides free legal assistance in family and civil cases for those who qualify financially. Their funding is quite limited, so they have other criteria but it sounds like the facts of your case would be a fit if you qualify financially. If you don't qualify, contact the Tarrant County Bar Association referral service.
Contact the court and ask the court to appoint you a lawyer. Whenever there is a possibility of termination, the court has the authority to appoint counsel. If you are not named as a party in their suit, tell them they need to, so that you would qualify for a court appointed attorney.
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Legal Aid of Northwest Texas should be able to assist you. The court may also be able to appoint a lawyer to represent you depending on your relationship to the children.
The information provided is not advice but a legal perspective and you should schedule a consultation with the lawyer of your choice.
If you need a protective order to escape a dangerous situation, you should contact the district our county attorneys office in your area. They are responsible for assisting victim's seeking protective orders and there is no charge for this service. If you are able to get a protective order through your district or county attorney's office, your divorce will be safer and probably less complicated.