Here is some information on the Sampson family from the inventory of the Talbot County estate of Thomas Martin on 27 September 1734:

Elizabeth Sampson a Molattoe having 4 years to serve - 8 pounds
Mag Sampson a Molatto having about 11 or 12 years to serve - 17
William Sampson a molattoe to serve about 13 years - 20 pounds
Sisly Sampson a molattoe to serve 17 or 18 years - 19 pounds
Priscilla Sampson a Molatto to serve 21 or 22 years - 16 pounds
Rachele Sampson (no race indicated) to serve to the age of 21 - 5 pounds
[Prerogative Court Inventories 1734-6, volume 19, pp.156-9].

They were probably related to the Sampson family that was counted as "other free" in Kent and Dorchester counties.
Paul