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I think you need to get in touch with the Hamilton Co, TX Genealogical Society. They just put out vol 2 of "A History of Hamilton County, Texas". On page 62 is a bio on Otto Lucas b 1875 second son of Ernest Peter Lucas and Katherine Siegmund Lucas. Otto had 5 bros -- John, Emil, Henry, William and Edward. If this is your line, the Gen Soc should be able to get you in touch with Leman Lucas, the submitter of the sketch.
Plus, post your query on the Hamilton Co, TX GenWeb site, it receives a few more hits then the GenForum counties -- always good to post on both, you never know who is using which one.