Thanks for the information. I had been able to determine the answer to my questions since my post to this board in July 2008.
Silwold is the correct spelling of Sophia’s maiden name. Sophia was the third child of Henry Silwold Apr 1822-20 Oct 1901 and Charlotte “Lottie” Depping Dec 1883-DOD unknown, both born in Prussia. The family removed Illinois to Wisconsin in 1855 and Wisconsin to Iowa in 1866 where, with the exception of Sophia, all members lived for the remainder of their lives. Sophia was last counted in the 1905 Iowa State Census of Newton, Jasper County, Iowa. She and William Kelly married 30 Sep 1909 in Glenns Ferry, Elmore County, Idaho according to the Idaho Marriages, 1842-1996 data base, the marriage record found in the Fremont County, Idaho Courthouse, Volume 2, page 351.
William J. Kelly (aka John William Kelley) 24 Jan 1867-11 Dec 1955 was born in Center Township, Cedar County, Iowa, the oldest child of James Kelly 6 Nov 1839-29 Feb 1896 and Laura Heywood 8 Apr 1846-7 Apr 1941. James and Laura are buried in the Wittemburg Cemetery, Jasper County, Iowa.
While the 1900 Federal Census entry for William Kelly in Antelope, Kimball County, Nebraska indicated that William had been married for two years, I have found no record of the Nettie Banze named in the Special Collections & Family History, BYU.
Thanks for your help.