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You can obtain microfilm copies of the TX County tax records on interlibrary loan through your local public library. Even if they did not own land, there might have been a pole tax. Always watch for them in the South. My husband had a family referred to, by the family, as dirt farmers. Guess they were too poor to raise much, but dirt. I wasn't going to look for them on tax record, but had the Fannin Co, TX county tax record on loan for another family in that county. I watched for Meek, thinking I might see someone else that belonged to the family, and there he was, John Henry Meek. He owned a mule and paid a pole tax. I know it doesn't tell a lot, but it will give an indication of when they appeared, and disappeared from the county.
I'm not sure about TX, but in states like KY, VA etc, when young males reached "majority", 18 or 21, depending on time and law, they had to pay a pole tax, even if they still lived at home. And, if they owned their own horse, that would show up, too.