Oh Very, Very Simple One:

1. since you are incapable of performing even the Simplest tasks for yourself,like a two-second web search for example, start here:

www.monticello.org/plantation/hemingscontro/hemings_resource.html

2. For a detailed explanation see Gordon-Reed's Thomas Jefferson and Sally Hemings: an American Controversy Univ. of Va Press, 1997.

3. For an analysis of more recent information, see Gordon-Reed's The Hemingses of Monticello: An American Family W. W. Norton, 2008

5. Fuck Off