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There is nothing in the law in Texas which requires a court order to allow your uncle to take your son to the doctor's appointments. You would likely need to sign a HIPAA release form to allow the doctor to discuss your son's issues with the uncle and you could give your uncle a limited Power of Attorney to allow him to make medical decisions for you son, to sign papers, etc. but that can be drafted by any attorney and doesn't require a judge's signature and it is not a court order, temporary or otherwise.
I'm not sure what other questions you have but you can ask them in this thread.
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Of course, please feel free to ask any follow up questions in this thread. I want to be sure that all of your questions are answered. In addition, once you issue your Positive Rating the question will lock open and no longer time out so you can come back to it anytime in the future if you think of any follow ups.