Was curious if you ever received any information on this. The Charles W Messamore who married MARY FERRILL was not the son of Charles T and Eliza Tweedy Messamore.Their son was married first to Annie McDaniel who was deceased by the time of the census you have posted. The two children are his and Annie's.He remarried in 1901.
The Charles W who was married to Mary Ferrill was the son of James and Luvinie Hagler Messamore.Mary is the daughter of Robert and Emily as you also posted.If you would like a copy of the marriage license I would be happy to send.Have done extensive Messamore research in Union County, IL.The marriage took place in Cobden.
As a footnote, Mary Ferrill Messamore died in 1941 in Pamona, Jackson County, IL which is just to the north of Union.