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. Around 1800, she married William Costin. After Martha Washington's death in 1802, she became the property of Martha's granddaugher Elizabeth Custis Law. Thomas Law, Elizabeth's husband at the time, manumitted William Costin in 1802, and later Philadelphia in June of 1807. She relocated to the District of Columbia together with her husband, 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.