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1.Ulysses S. Grant and Franklin Roosevelt
4th Cousins 1x Removed
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3rd Cousins
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2nd Cousins 4x removed
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Johnathan Delano is their common Ancestor, being Grant's 3x great grandfather and Roosevelt's 4x great grandfather
2.George H. W. Bush and George W. Bush
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Brothers
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Uncle and Nephew
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Father and Son
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3.Richard Nixon and Jimmy Carter
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6th Cousins
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They share the same 5x great grandfather, Richard Morris.
4.James Madison and Zachary Taylor
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These two share the same great grandfather, James Taylor, but they also share another ancestor. James Madison's 2x great grandfather, Francis Thomas, is Zachary Taylor's 3x great grandfather.
5.William Henry Harrison and Benjamin Harrison
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Father and Son
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Grandfather and Grandson
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Granduncle and Grandnephew
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William Henry Harrison's son, John Scott Harrison, is Benjamin Harrison's father.
6.Theodore Roosevelt and Franklin Roosevelt
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Nicholas Roosevelt is the two's 4th great grandfather. Coincidentally, Franklin's wife is Theodore's niece!
7.John Adams and John Quincy Adams
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Uncle and Nephew
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Father and Son
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8.James Madison and James Polk
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1st Cousins
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They share the same ancestor, James Taylor, who is Polk's 2x great grandfather, but, but Madison's great grandfather.
9.John Adams and Calvin Coolidge
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Adam's 2x great grandfather, John Alden is Coolidge's 7x great grandfather.
10.James Madison and Barack Obama
2nd Cousins 7x Removed
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6th Cousins 4x Removed
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3rd Cousins 9x Removed
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8th Cousins 5x Removed
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Edwin Conway is Madison's 2x great grandfather, and Obama's 11x great grandfather
I'm nominating this quiz because we need more American political quizzes on a site full of geography quizzes, even though I wouldn't have gotten the full 5 points on it had it been featured right now.