What you are inquiring about sounds like a discovery issue. Writs of possession have nothing to do with discovery.
The procdural vehicle for obtaining documents in a contested probate proceeding is a request for production. If a party to the legal proceeding has the documents, you serve the RP on that party, as per Tex. R. Civ. P. 196.1(a). If the person or entity who has the documents is a non-party and the documents are medical or mental health records, you proceed as required by Tex. R. Civ. P. 196.1(c). Other kinds of records can be obtained from non-parties through oral depositions or depositions on written questions by using subpoenas, if necessary.
It sounds like you are trying to represent yourself in a contested probate matter. If so, you really need to consult an experienced probate lawyer. No matter what the controversy is about, your chances of winning without a lawyer are going to be very poor.
Request for production or by subpoena duces tecum.
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A writ of possession is issued after an eviction dispute. It isn't what you are looking for. The executor/administrator have authority to go obtain the relevant documents. The procedural vehicle to use would depend on the circumstances.
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