The Hassler family in Germany has been traced as far back as 1750. On July 25, 1858, Marie Katherina Wunderlich married Wilhelm Hassler in the church in Birkalbach, Germany. In 1861, the Hasslers with children Heinrich and Friedrich, immigrated to Texas.
In Texas, the Hasslers settled in the Big Cypress area and began farming, however, Wilhelm passed away a few years later. In 1865, Katherina married Heinrich Kaiser, a veteran of the Civil War, and they had several children of their own together while also raising Heinrich Hassler. Descendants of Heinrich continue to live in the Klein community.