Presidential Trivia (Nov. 3 & 4)

Answers will be posted tomorrow afternoon.

(1) We’ve had three Presidents during the course of a single calendar year on two different occasions. What years? Who were the Presidents? HT to @Jeff S. for the question idea.

(2) How many Presidents have we had with the same last name? Which one(s) were or were not related to each other? HT to @Tom Z. for the question idea.

(3) On five occasions, two or more future Presidents were born in the same calendar year. Which Presidents? Bonus points if you know which years. HT to @Walter W. for the question idea.