Lincoln Washington Descendants — There are no living direct descendants of either Abraham Lincoln or George Washington.
The last undisputed descendant of Honest Abe was his great-grandson Robert Todd Lincoln Beckworth who had three marriages which produced one son but (cough) during a divorce and after his vasectomy. Beckworth denied the paternity and this was upheld by the courts. Beckworth died in 1985 at the age of 81.
While G.W. had two step children from Martha’s first marriage, he never had any of his own as smallpox likely rendered him sterile.