I am looking for info on the family of John (Johann) Leppert and Helen (Helena) Brown (Braun) who came to America in 1900 from the Ukraine. They show up in the 1905 Census for Edmunds County, South Dakota, and 3 of their 6 children were supposedly born there.

The family is as follows:
John (Johann) Leppert b: abt 1857 in Klein-Liebenthal, Odessa, Ukraine, USSR. D: 11 April 1911 in Bowdle, Edmunds County, SD.
He married Helen (Helena) Brown (Braun) b: abt 1865 in Germany and d: 18 Feb 1910 in Bowdle, Edmunds County, SD.

Their children:
Catherine (Katie) Leppert b: 8 Dec 1888 in Klein-Liebenthal, Odessa, Ukraine, USSR, married Sylvester John Wildamann 10 April 1907 in Roscoe, Edmunds County, SD and died 22 Nov 1932 in Washington.

Joseph/Joe John Leppert b: abt 1891 in Klein-Liebenthal, Odessa, Ukraine, USSR, died 25 December 1956, place unknown.

Lucy b: 27 April 1893 in Klein-Liebenthal, Odessa, Ukraine, USSR, died 21 jan 1979, place unknown. She married a Mr. Sanders.

Johanna Leppert b: 22 Mar 1902 in Bowdle, Edmunds County, SD, she married a Mr Rohwein.

Margaret Leppert b: 6 January 1904 in Bowdle, Edmunds County, SD.

August Lewis Leppert b: 20 Nov 1907 in Bowdle, Edmunds County, SD.

Any help would be greatly appreciated!