Edigus/Thadeus Lehmann and Amelia/Emily nee Seehofer/Seeover/Seifinth Lehmann

Hallo/Hello,
Does anyone have information on:
Hat jemand einige Info über:

Edigus/Thadeus/Edidus/Egaclus Lehmann, born about 1840, and who apparently died in Mason City, Iowa? He apparently was born in and emigrated from Hannover, perhaps about 1870. The 1880 census shows that Thadeus Lehman was a farmer living near Owen, Cerro Gordo County, Iowa with Amelia and four children.
Herr Lehmann's Frau Amelia/Emalie/Emily nee Seehofer/Seeover/Seifinth, born about 1842, and who apparently died in Mason City, Iowa. Frau Lehmann may have emigrated from Hannover, perhaps about 1870.

I don't know if they were married before emigrating.
Children apparently were:
Herman, born in Iowa about 1875
Charles/Charly, born about 1873 or 1876 in Iowa
Ida, born about Nov., 1877 in Iowa
Wilhelmina, born about Nov., 1879 in Iowa
Albert, born after 1880
Edward O., born about 1883 in Iowa
Arthur (18/3/1884-10/7/1954), born in Iowa and died in Los Angeles, California
I have good information on Arthur.
Vielen Dank aus Saint Paul, Minnesota,
Edward Lanis