According to the IMDB page for Tom Hanks:
http://www.imdb.com/name/nm0000158/bio
"He is a third cousin, four generations removed, of former U.S. President Abraham Lincoln. Their common ancestor is John Hanks (1680 - 1740), who was the great-great-grandfather of Lincoln, and the great-great-great-great-great-great-grandfather of Tom Hanks."
John Hanks, I is Tom Hanks' 6th g-grandfather here on geni, so far so good.
William Hanks, II is Abraham Lincoln's 2nd g-grandfather on geni though.
Thoughts?