What does the term "In Rem Only" mean regarding an ad valorem tax case?

Question Details:

I have recently been sent a document naming me as a defendant in a Texas ad valorem tax case. There are approximately 60 defendants listed with most having "In Rem Only" following their name including myself. The property in question was once owned by a distant uncle of my mother. The man passed away about 25 years ago and my mother received a small monetary inheritance. My mother also passed away in 1992. These papers state that "Plaintiff(s) do not seek any monetary relief or personal judgment against any defendant identified as "In Rem Only". Am I responsible for any back taxes?

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