In the 1910 Census Frederick (65) states he arrived in the US in 1866, and states that he was a naturalized, but not when. Katherine (spelled Catherine in 1910 Census) also arrived in 1866. Katherine (68) had 12 children, 4 of whom lived. In the 1910 Census they also listed one 18 year old son who was adopted. The house is listed as 120 S Seventh St in Saline Kansas.
Katherine lists her birthplace as U Hessen, probably Hessen-Darmstadt in Germany in the 1880 Census.