The biography reflects that he was born ca. 1831 in Indiana and that he was raised near Moscow, Iowa.
He seems to the son of John Yager and Sarah Jane Juvenall. John, a lawyer, was born ca. 1794 in Virginia and married Sarah Jane Juvenall on January 17, 1827, in Perryville, Vermillion County, Indiana. http://listsearches.rootsweb.com/th/read/YEAGER/2006-05/1146832552http://listsearches.rootsweb.com/th/read/YEAGER/2006-05/1146832552.