I am researching the Goings and Duffs from Arlington, Virginia and Washington DC. They were multiracial families that lived in the area from at least the early 1800's. Two daughters of James Duff married Goings men:
Sarah Jane Duff b. abt. 1807 married Calvin or Calvert, Goings b. abt 1803.
Susanna Duff abt. 1808 – 1884 married John Goings abt. 1805 – 1873
They had a sister:
Priscilla Duff b. abt. 1789-1814. married Rezen Reason White
Their parents were:
James Duff abt. 1770 – 1831
Nancy Thompson b. abt 1775
They were free persons of color, and depending on what record you look at they were classified as White, Colored, Mulatto, Native American.