David Thomas's mother Elizabeth was the daughter of American Revolutionary War soldier John Purviance of Rowan County, who married Mary Jane Wasson. One of Elizabeth's brothers was David Purviance, who is listed as a co-founder with Barton Stone of the Christian Church-Church of Christ which originated at the Cane Ridge Meeting House in Bourbon County, Kentucky, outside Paris, Kentucky, circa 1804. David Purviance served in the Kentucky and Ohio legislatures, where he continually advocated abolitionism, and was an early trustee of Miami University, serving often as the board's president "pro tempore". Levi Purviance wrote a biography of the father David Purviance. A birth quilt made by his family is crafted "D.O. Thomas", but his middle name is unknown and it is possible that the intent was "DP" for "David Purviance Thomas", reflecting his mother's maiden name.