It's curious that his lineage dying out is an example of a very counter-intuitive theory - that the one person who is the common ancestor of everyone alive today lived as recently as the time of Christ. Basically very few people keep their genetic lines open for more than a few generations, those that do are ancestors of enormous numbers of us.
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Despite Lincoln having four sons sadly he has no living descendants. His line ended 1985 with the death of his 81 year old great-grandson.
There is a disputed descendent, born 1968 and today living in Florida, but his DNA was never tested:
http://en.wikipedia.org/wiki/Timothy_Lincoln_Beckwith
It's curious that his lineage dying out is an example of a very counter-intuitive theory - that the one person who is the common ancestor of everyone alive today lived as recently as the time of Christ. Basically very few people keep their genetic lines open for more than a few generations, those that do are ancestors of enormous numbers of us.
http://tedlab.mit.edu/~dr/Papers/Rohde-MRCA-two.pdf