Martha Parke Custis Peter was a granddaughter of Martha Dandridge Washington and a step-granddaughter of George Washington.

Elizabeth Parke Custis Law, sometimes known as Eliza Law, was the eldest granddaughter of Martha Dandridge Washington and a step-grandchild of George Washington. She married Thomas Law, the youngest son of the late bishop of Carlisle, England, and an experienced administrator with the East India Company.