The Sophia Kamphaus that u referred to was George's daughter-in-law, who died at a edyoung woman's age. I did find Wilhelm and his first wife along with the oldest brother of Wilhelm son in the 1850 US census rpt in Clayton county Iowa. I also find Wihelm in the 1852, 1854 and 1856 Iowa census reports. Elizabeth shows in 1854 or 1856.
In 1860 i find nothing but he shows ip in 1870 with his last wife, Sophia. So I assume his first wife, then Elizabeth and two of Wilhelm's oldest sons die in the Guttenburg area between 1852- 1859. He marries Sophia in 1860 in Cincinnati Ohio.
That is why I think the Catholic church in Guttenburg holds all the answers. The church claims all the records for this time frame are in Dubuque Iowa.
So that is where i am sitting.
Thanks for ur research,