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I am sorry to hear about your son's situation.
In Texas as well as most US jurisdictions, property owned before marriage, gained through inheritance, gained via a gift, or gained via judgment - this remains the separate property of the owner and is not subject to division in marriage.
So if you are telling me that he already owned the property before the marriage, then she would have no interest in it in a divorce. At the same time, the inherited property is the same way - she'd have no interest in that, either.
However, if he put her name on one/both of those properties, then whichever property he put her name on becomes community property and is subject to division.
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