
Jacob was twenty years old when he arrived in Texas. He sailed on the ship Mississippi with his father and mother, Phillip Jacob, and Margarethe Kessler Theis and his siblings. They were from Offenbach, Nassau (Germany).
Jacob married Wilhelmine Gass on 2 October 1860. In the 1870 Kendall County Census, his profession is blacksmith, is married to Wilhelmine and has four children. By 1900 they have a total of eleven children, Robert, Anna (Achterberg), Emma, Lina (Dietert), Rudolph, Alma (Phillip), Louise (Bergmann), Emilie, Clara (Toepperwein), August, and Ida.

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Boerne Cemetery (Boerne, Kendall County, Texas). Jacob Theis. marker; personally read November 2020.
1870 Kendall County Census, Ancestry.com.
1900 Kendall County Census, Ancestry.com.
“Jacob Theis.” Death Certificates, 1903-1982. Ancestry.com.