Well Have you also heard of it put this way as well...??? This is also what I had found regarding My Family's History and whom and or what I am connected to as well. (''George Washington is ''Mary Custis'', the only (legitimate) surviving child of George Washington, Robert E. Lee was married to: Mary Custis, it is through ''Mary Custis'', the only (legitimate) ''LEGITIMATE BIOLOGICAL CHILD'' surviving child of George Washington. While Parke Custis, the Step-Grandson and Adopted Son of George Washington. Was The Half Descendant Line of George Washington and All descendants of Robert E. Lee are therefore descendants of Martha Washington the Mother of ''Mary Custis'' (by her first husband) ''GEORGE WASHINGTON'' as well. (G.W.P. Custis had a sister who also has descendants {I.E. Living Today As Living Breathing Descendants, so the reverse is not true [i.e. not all descendants of Martha W. are descendants of Lee]).'') This would be another way of putting it too....!!!!