James Carr Frazier McElwain (born May 14, 1821)was the son of Alexander McElwain & Mary (Polly) Frazier. James married his second wife, Elizabeth A. Thompson on Nov. 6, 1862. George Alexander McElwain (Feb 14, 1869-Aug 6, 1937)was one of their children. George married Jesse Ware Dickinson (1872-1961) on Oct 18, 1893.
John Walker McElwain was James Carr Frazier McElwain's brother so Martha would have been a cousin of George A. McElwain. I hope this helps. Georgia