I found only one family in Dekalb County in 1850: Aaron B Fetters 31 and wife Elizabeth 19 with Aaron B Jr 1/24 (??) and Theodore 2.
Dekalb Co, IN had two Fetters families in 1860 census.Ferdinand Fetters 30 from France with wife Jane 26 in Smithfield Twp and Aaron B Fetters 40 with wife Elizabeth 30.This couple had been in Illinois as four chldren were born there and then 2 in Indiana. There is Aaron B jr 10 and Theodore 12 and Mary A 7 Henryetta 5 Levi J 3 and Deliah 1.
Then in 1880 I list Jacob 54 and wife Rosina from IND 16 family.Jacob is from Prussia and Rosina from Baden.
in 1900 I have Jacob 74 and Rosina 68 with both from Germany. John D Fetters 39 and wife Bertie C 35 with LG 16 and Jay Earl 13 who are from PA10. And Ferdinand 60 and Franklin Fetters (1854) in Fairfield with aunt Martha Fetters.
As mentioned earlier, PA 10 and Chapter 9 folks appear to have no connection at this time.It is coincidence that they are in the same proximity.
Do you have more information on the two men you mentioned as being in Williams Co, OH?