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You could try to do it yourself if you qualify for legal aid or the clerk of the court will give you direction where to obtain the forms you need.
You would need to register the out of state custody order in TX, then file a motion to modify the order to reflect the current custody arrangement.
The state bar association can provide you with attorney referrals, as well as information on low cost or pro bono services that may be available in your area.
Please let me know if you need additional information.
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