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Mr. & Mrs. Knight from Washington County, PA. They could be related to the David Hartman family or the Wyeth or Schroeder families with roots in Washington County.
Or they could have been neighbors of Charles and Mary Ann Wyeth Schroeder of Washington, PA. Mary Ann later married George Pettit after Charles' death in 1941.
Charles Schroeder born 1882, son of Peter William and Augusta Runge Schroeder. Mary Ann Wyeth born 1885, daughter of George B. Mc. and Elizabeth Hartman Wyeth.
If you are a family member of Mr. & Mrs. Knight, please let Midge know and she will snail mail you the picture for your family use.