Although Thomas Jefferson did not have any sons who survived to produce children, his father's brother, Field Jefferson, did have sons and it has been possible to locate 5 descendants of Field Jefferson who are in a direct male-line of descent. In fact, one of Woodson's descendants did not match well with the other four. This lends credence to the supposition that Thomas Jefferson may have been the father of Eston Hemings. And 23 of them were younger than Jefferson, who was 65 years old when Eston was conceived.
More detailed information is available .
Three different authors provide some perspective on Jefferson and Hemings in The Nation . Annette Gordon-Reed has written about the possible relationship between Jefferson and Hemings. This document maintained by Robert J. Huskey Last updated on January 27, 2000.