Judge, Philadelphia, approximately 1780-1831

Philadelphia (Delphy) Judge Costin was born circa 1780 at Mount Vernon in Virginia. Her mother Betty was a dower slave of Martha Dandridge Custis Washington. She was the sister of Ona Judge who ran away from Mount Vernon to seek freedom in New Hampshire. At Martha Washington's death, she became the property of Martha's grand daugher Elizabeth Custis Law. Thomas Law, Elizabeth's former husband, manumitted Philadelphia in June of 1807. She married William Costin in the District of Columbia and gave birth to seven children.

• William Custis Parke Costin
• George Calvert Parke Costin (1822-1876)
• Ann Parke Costin (born about 1806)
• Charlotte Parke Costin (1807-1880)
• Fanny Parke Costin
• Martha Parke Costin (1817-1898)
• Louisa Parke Costin (1804-1831)

She died on December 13, 1831.