Can't offer much beyond moral support as I just started looking at the BARTLETT family in Madison Co. myself.
Daniel BARTLETT was married to Sarah Elizabeth SAPPINGTON, 24 December 1866 in Madison Co IL. They were the parents of
Jessee F BARTLETT born ca. 1869 in IL Caleb V BARTLETT born ca. 1870 in MO Nannie BARTLETT born ca. 1872 in MO
Mrs. Sarah Elizabeth BARTLETT was married to John James WILSON, 1 January 1877 in Madison Co IL. I do not know but assume that Daniel had died as the two boys, Jesse and Caleb were in Washington Co AR with their uncle David R SAPPINGTON for the 1880 census. Nannie was living with her mother and step father in Marine, Madison Co. IL at that time.
Can't say much about the two younger children being born in MO. Sarah's parents were in Chariton Co MO for the 1870 census so it's possible that Daniel and Sarah went there as well.
My interest is in the SAPPINGTON line but any information you might have concerning Daniel BARTLETT or his children would be of interest.