Look at this family: Asa Gates Kilbury b 1807 VT d 1884 Union Co OH Ruth Clark b 1825 OH d aft 1880 (Possibly buried in Jerome Cemetery in Union Co)
1850 Canaan, Madison Co OH 1860 Canaan, Madison Co OH 1870 Darby, Union Co OH 1880 Darby, Union Co OH
Children: Rachel b 1834 OH James S b 1838 OH Robert b 1846 OH Mortimer b 1851 OH Asa Dunbar b 1856 OH Solomon b 1858 OH
Asa Dunbar stayed in OH & is buried in Jerome Cemetery, Union Co OH. James S & Mortimer went to Champaign Co IL.
James S Kilbury m Hannah E Beard, 1868 Union Co OH Mortimer Kilbury m Mary L Friedrich, 23 Sep 1877 Vermilion Co IL (IL State Archives)
1880 St Joseph, Champaign Co IL M KILLBERY b 1851 OH w/ wife Mary & son Asa J S KELBURY b 1839 OH w/ wife Hannah & dau Hariette
ILgenweb > Champaign Co & IL Trails > Champaign Co list: 1878 Champaign Patrons: James S Kilbury b Madison Co OH H E Kilbury (wife of James) b Union Co OH Mortimer Kilbury b Madison Co OH M L Kilbury (wife of Mortimer) b Vermilion Co IL
Portrait & Biographical Albums of 1887 & 1918 have listings for James & Mortimer with volunteers who will do look ups.
Search on these sites found that Genealogy Society has family photos & obit for Mortimer d 29 Apr 1926, burial was in Mt Olive Cemetery in St Joseph IL.
(This is not my family. I was researching a Whiteside - Kilbury family that also came from OH to IL)