As I mentioned in a blog entry that I made last year, my wife may be a distant cousin of Abraham Lincoln through his mother Nancy Hanks. The only problem proving this, however, is that there were many different women named Nancy Hanks that could have possibly been his mother. There is no definate way of showing my wife's relationship to this American president.
A discussion about the true identity of Nancy Hanks can be found on the webpage Will the Real Nancy Hanks Please Stand Up?
For more information about the Hanks Family, check out Hanks for the Memories.