That makes sense. Sally (born about 1750), Judy (born about 1766) and Suckey (born about 1775) Hollinger were all free-born African Americans. Judy's children were described as "dark Mulatoes" in the Essex County Register. Suckey's children were described as "bright Mulattoes."
Perhaps they were descendants of Ursula Hollinger who was sued in Essex County court for trespass, assault and battery on 22 June 1785.
Paul