No harm, no foul. I think Martha had descendants though... ah, here it is... Mary Anne Randolph Custis Lee (wife of Robert E. Lee) was the grand-daughter of Martha.
Also, years ago (like 35) I recall reading a claim by a Japanese woman that Washington was her ancestor via his affair with a Japanese woman who worked for him.
Probably happened during his attendance at a conference on the planet Mars. ;')
http://www.homeofheroes.com/moh/memory/arlington.html
"George and Martha Washington had no children of their own, but the widowed Martha Dandridge Custis had brought two children to the family when the couple married in 1759. John Parke and Martha Parke Custis had grown up under the fatherly hand of George Washington. John named a son in his step father's honor, George Washington Parke Custis. When John Parke was killed at Yorktown in 1781, George and Martha Washington adopted two of their grandchildren. It was, therefore, the step-grandson of George Washington who would receive the estate of the Washington/Custis family. Included in that estate was the 1,100 acres overlooking the Capitol."
See my post 25 above. John ("Jacky") was not killed at Yorktown, however; he died of camp fever, probably typhus.