Based on information from Anna Hopkins-Arnold, there were two Rosewell Riggs Chapman men. The man often cited as the father of John O. and siblings actually died unmarried and without issue. The father was actually Roswell Riggs Chapman, born in Blandford, Hampden Co, Massachusetts 21 Sep 1793 (or 1794).
Documentation of this relationship is The History of Union County, OH.(W. H. Beers & Co., Chicago, 1883.p 86); that contains a biography of Albert S. Chapman, John O.'s brother, and lists the birthplaces of their parents this way: "A. S. CHAPMAN. The parents of the gentleman whose name heads this notice were Roswell Riggs Chapman, born in Blandford, Mass,, September 21, 1793, and Phoebe Stansbery, born in Scotch Plains, N. J., March 1, 1798."
This article provides details that increase its credibility as a source for the birthplace. In addition, sexton records from Natchez, MS*(5). confirm that the Union County History was correct about Roswell Riggs Chapman's death from consumption (tuberculosis) on a Mississippi steamer and burial at Natchez, MI. The Union County History account differed from the information in the Chapman Book, but the Union County acct was proven correct.