German immigrant children Theodor b. 1876, Mary 1878, Frank (maybe 1883 or 1875. Mother Anna Died 1888 (b. 1855 Germany - came US 1885 with children whereabouts of father of kids (Joseph Miller unknown). The children were quite young - can't find them (no 1890 census), found Theodor in 1900 staying with a Siefiet family as hired hand. Jackson County, Iowa.
I believe that Anna's parents Louis Nagel, Nagle, Nagele, b. 1827 and wife Conda or K. came to USA in 1882 with a son Louis Jr. I can't find them in 1895 census either. And, perhaps Bertha who married Andrew Morey in 1888?.
Is there an Iowa census? would those children be listed? Or where else may the children have ended up?