William Bell married Fanny Boston. They Had one child that I know of. Frances Kirtley Bell. Hemarried Mary Poll Powell. There daughter was Mary Margaret Bell. Your Mary Margaret may be the daughter of either Lewis Leavell or Rueben Powell Bell or John Wesley Bell since her birth Date falls within the time frame of them having children. I have not done much research on the Bells from Bells Mountain( now called Cameron Mountain in Gordonsville Va. Something to think about. Cathy