Your original message is several years old but I do hope that this reaches you. Your posted email address bounced back today as undeliverable. I recently had a break through on an Evans (and Thompson) line(s) I have been researching in Wapello County Iowa. I strongly feel that the Evans of my research in Iowa were children of James Evans of Warrick County Iowa. I may also have informartion or leads that may help you if my speculations are correct. Do you have the names of the children of James and Sarah Evans? Do you know when and where James and Sarah died?
Here is a gist of what I have: William Taylor Thompson married Mary (Polly Ann) Evans 29 Oct 1842, and Jacob Thompson married Rhoda Evans 16 Nov 1844, in Warrick County Indiana.
I speculate that Wm and Jacob were brothers and that Mary/Polly and Rhoda were sisters. These two families left Warrick County between 1845 and 1850 and were in Wapello County Iowa for the 1850 census. Jacob and Rhoda later went west and settled in Linn County Oregon.
From the 1850 census in Wapello County, Iowa and other records, I speculate the following Evans were likely siblings:
Polly Ann (Mary) Evans born ca 1821 Indiana (father given as born KY and mother NC)
Rhoda Evans born ca 1823 Indiana (father given as born KY and mother NC)
Henry H. Evans born ca 1825 Indiana
Sarah A. Evans born ca 1830 Indiana (father born KY mother NC)
Isaac Evans born ca 1841 Indiana
Caroline Evans born ca 1836 Indiana
From the census years James Evans was enumerated from 1820 to 1840, it would seem that James (if it was the same James each census year) might have had 11 children born between
years 1811 and 1840 (two sons and nine daughters). Also, perhaps another marriage before Sarah/Sally?
James and Sarah Evans had Isaac E. age 19 in their household in the 1860 census and that fits for the Isaac age 9 in the household of Henry Evans in 1850 Wapello Co Census. Further, the birthplaces given for the parents of Polly, Sarah, and Rhoda in the 1880 census, match the information for James and Sarah Evans in the 1860 census. I find this an encouraging clue.
There was a James Evans in early Wapello County and whom I loose track of before 1860 and whom I have not located in the 1850 census. That will be another clue I will revisit.
I hope this information helps you and I would appreciate hearing from you and any help or suggestions you might be able to provide. Thank you and best regards, Vicky