Wow. It would be easier to say which Presidents I'm NOT related to. One odd thing: for two of them, the page said No Relationship Found, yet, there they were, the relationship trees. In fact, for both, it showed multiple ways I'm related, yet still the No Relationship Found at the top of the page. Bill Clinton and Barack Obama were the two.
Anyway, this was a pretty cool thing I look forward to sharing with my little nephews.