Franklin D. Roosevelt - 32nd President of the United States was related, either by blood or by marriage, to 11 former presidents.
Nixon (11) - Fillmore, Hayes, Taft, Harding, Coolidge, Hoover, FDR, Ford, Carter, both Bushes
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John Adams was the father of John Quincy Adams, George Bush Sr. was the father of George W. Bush, William Henry Harrison was the grandfather of Benjamin Harrison, and Theodore and Franklin D. Roosevelt were distant cousins.
John and John Quincy Adams were father and son. William and Benjamin Harrison were grandfather/grandson. Theodore and Franklin Roosevelt were distant cousins. George and George W. Bush are also father and son. Andrew and Lyndon Johnson share a common last name, but were not related.
The 32nd president of the United States, Franklin D. Roosevelt, was related to eleven presidents.
If you could trace their ancestry back far enough you could probably find common ancestors for any pair of presidents, so in a way, they are no doubt all related. However, in the usual sense, people are said to be related only if the relationship is known and fairly close, so in this sense, US presidents are not all related. Some, of course, have been closely related to each other.
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Party identification and straight-ticket voting are related because they each only vote for one single party. They don't stray to the other party for any reason.
If you're asking whether any US Presidents were constitutionally ineligible to hold office, the answer is no.
There hasn't been any presidents from Rhode Island, yet.