Or I should say Hello Cousin, because we appear to be related. Hosea, as we call him, is our great-grandfather, too. My name is Patricia Duvall and I descend from Hosea's son William. All of the names you mention match our family research closely, and we were certainly aware of your grandfather, Clyde. Let me highlight a few things we have found about Hosea.
In the 1860 Census for Scotland County, MO, Hosea is listed with his family, the William Manson DuVall family. Hosea is 1 year old, born 1859. Next door is the Jacob DuVall family. William is married to Bethia Leach and Jacob is married to Leta (Letitia) Leach; sisters. We believe William and Jacob are also related, but we cannot document yet if they are brothers, or nephew and uncle. As you can see in this census, Hosea has a brother, Jacob born 1 Feb 1853 in KY. This appears to be the Jacob that you mention.
By Aug. 1862, the William M. DuVall family moves to Henderson County, IL. William enters the Union Army in Oquawka, IL and dies in 1863 at the Battle of Chickamauga. Hosea's sister, Margaret L., is born Feb 1863.
Hosea's mother, Bethia, remarries to Charles H Montcalm in Henderson County, Il, 11 Mar 1866. Hosea's half-brother, Charles H. Montcalm Jr., is born about 1868 in MN. The family appears next in the 1870 census in Ralls Co., MO. They are listed as 2 families living in the same dwelling, Montcalm and Dewall; with both DuVall and Hosea misspelled. Hosea's 2 sisters, Rosamond and Margaret, are not listed with the family in 1870. At this point we lose track of the family. We have not found when or where Bethia dies.
The next documentation we have on Hosea is a marriage license for Hosea Duvall and Sarah F. Bradburn (Bradbern?) 11 Nov 1883 in Quincy, Adams County, IL. Sarah appears to be the mother of Ada DuVall that you mentioned in your post. We do not know what happens to Sarah.
Hosea Duvall and Ida Metzinger get a marriage license in Marion County, MO on 28 May 1890. Our family could not find any info on Ida before she was married to Hosea. We welcome any information you have on her! Just recently we also found the 1900 census for Hosea and Ida with their 4 children and Ada! Ada is listed later in Hosea's estate papers as Ada Woodson; we assume she married.
From your post, it seems that you have not heard the story of Hosea's death. Hosea dies 1 Dec 1906 on a houseboat at LaGrange, MO. Hosea was acting as a constable helping the Marshal recover a debt owed by actors living on the hoseboat. One of the actors shot Hosea with a revolver and he died shortly after. Articles concerning this incident where published in the Chicago Tribune and the NY Times. I think the NY Times article is still listed if you google "Hosea Duvall"; the Tribune charges a fee for archived articles.
Hosea is buried in Riverview Cemetery in LaGrange Mo. with Ida. There is a Jacob M. Duvall buried close by, and we believe this to be Hosea's brother. Lewis County, MO Court House has Hosea's estate papers, but we do not have a copy, yet.
Jeff, it's great that we have made a connection! Only 2 months ago, our family made a connection with other Hosea great-grandchildren. They will be happy to hear about your post! We welcome any additional info you have about our mutual family and of course any corrections to our research!