It is absolutely insane to me that "our" country will have been lead by the same 2 families for 28 out of 36 years by 2025
Try 240 years of bs families:
Direct descent
John Adams and John Quincy Adams (father and son)
William Henry Harrison and Benjamin Harrison (grandfather and grandson)
George H. W. Bush and George W. Bush (father and son)
Indirect relatives
Second cousins
James Madison and Zachary Taylor
James Madison and James K. Polk (once removed)
Zachary Taylor and James K. Polk (once removed)
Third cousins
Martin Van Buren and Theodore Roosevelt (three times removed)
Martin Van Buren and Franklin Roosevelt (four times removed)
John Adams and Calvin Coolidge (five times removed)
James Madison and Barack Obama (nine times removed)
Fourth cousins
John Tyler and William Henry Harrison (once removed)
Ulysses Grant and Franklin D. Roosevelt (once removed)
John Adams and Millard Fillmore (three times removed)
John Quincy Adams and Franklin D. Roosevelt (three times removed)
Zachary Taylor and Franklin D. Roosevelt (half-cousins, three times removed)
James Garfield and George H. W. Bush (three times removed)
Lyndon Johnson and Barack Obama (three times removed)
John Quincy Adams and Calvin Coolidge (four times removed)
Franklin Pierce and Calvin Coolidge (four times removed)
James Garfield and George W. Bush (four times removed)
John Adams and William Taft (five times removed)
Franklin Pierce and Herbert Hoover (five times removed)
Millard Fillmore and George H. W. Bush (five times removed)
Millard Fillmore and George W. Bush (six times removed)
Fifth cousins
Theodore Roosevelt and Franklin Roosevelt
Millard Fillmore and Grover Cleveland (once removed)
Rutherford Hayes and Grover Cleveland (once removed)
John Tyler and Benjamin Harrison (once removed)
James Garfield and William Taft (once removed)
John Quincy Adams and Millard Fillmore (twice removed)
Millard Fillmore and Warren Harding (twice removed)
Ulysses Grant and Calvin Coolidge (three times removed)
John Quincy Adams and William Taft (four times removed)
Millard Fillmore and Herbert Hoover (four times removed)
Franklin Pierce and George H. W. Bush (four times removed)
Grover Cleveland and Gerald Ford (four times removed)
Millard Fillmore and Gerald Ford (five times removed)
Franklin Pierce and George W. Bush (five times removed)
Sixth cousins
Richard Nixon and Jimmy Carter
Millard Fillmore and William Taft (once removed)
Ulysses Grant and Grover Cleveland (once removed)
Rutherford Hayes and Franklin Roosevelt (once removed)
Grover Cleveland and William Taft (once removed)
Franklin Pierce and Franklin Roosevelt (twice removed)
James Garfield and Calvin Coolidge (twice removed)
William Taft and Franklin Roosevelt (twice removed)
Calvin Coolidge and Franklin D. Roosevelt (twice removed)
Calvin Coolidge and George H. W. Bush (twice removed)
Franklin Roosevelt and Gerald Ford (twice removed)
Ulysses Grant and Gerald Ford (three times removed)
Rutherford Hayes and Gerald Ford (three times removed)
Rutherford Hayes and George H. W. Bush (three times removed)
William Taft and George H. W. Bush (three times removed)
Calvin Coolidge and George W. Bush (three times removed)
Franklin Roosevelt and George H. W. Bush (three times removed)
Millard Fillmore and Calvin Coolidge (four times removed)
Rutherford Hayes and George W. Bush (four times removed)
William Taft and George W. Bush (four times removed)
Franklin Roosevelt and George W. Bush (four times removed)
Ulysses Grant and George H. W. Bush (five times removed)
Ulysses Grant and George W. Bush (six times removed)
Seventh cousins
Millard Fillmore and Ulysses Grant
Benjamin Harrison and William Taft
Gerald Ford and George H. W. Bush
William Taft and Calvin Coolidge (once removed)
Millard Fillmore and Franklin D. Roosevelt (once removed)
Gerald Ford and George W. Bush (once removed)
Grover Cleveland and George H. W. Bush (twice removed)
James Garfield and Richard Nixon (twice removed)
William Taft and Richard Nixon (twice removed)
William Taft and Gerald Ford (twice removed)
James Garfield and Herbert Hoover (three times removed)
James Garfield and Gerald Ford (three times removed)
Grover Cleveland and George W. Bush (three times removed)
Theodore Roosevelt and George H. W. Bush (three times removed)
Harry Truman and Barack Obama (three times removed)
Abraham Lincoln and Gerald Ford (four times removed)
Abraham Lincoln and George H. W. Bush (four times removed)
Theodore Roosevelt and George W. Bush (four times removed)
Abraham Lincoln and George W. Bush (five times removed)
Eighth cousins
Grover Cleveland and Franklin D. Roosevelt (half-cousins)
Rutherford B. Hayes and William Taft (once removed)
Calvin Coolidge and Herbert Hoover (once removed)
Calvin Coolidge and Richard Nixon (once removed)
Calvin Coolidge and Gerald Ford (once removed)
Herbert Hoover and Gerald Ford (once removed)
Franklin Roosevelt and Richard Nixon (once removed)
William Taft and Warren Harding (twice removed)
Richard Nixon and Gerald Ford (twice removed)
Jimmy Carter and Barack Obama (twice removed)
Rutherford B. Hayes and Richard Nixon (three times removed)
Ninth cousins
Warren Harding and Richard Nixon
Warren Harding and Jimmy Carter
Benjamin Harrison and Calvin Coolidge (once removed)
Warren Harding and Gerald Ford (once removed)
Richard Nixon and George H. W. Bush (once removed)
Richard Nixon and George W. Bush (twice removed)
Tenth cousins
Herbert Hoover and George H. W. Bush
Herbert Hoover and George W. Bush (once removed)
Gerald Ford and Barack Obama (once removed)
George H.W. Bush and Barack Obama (once removed)
George W. Bush and Barack Obama (twice removed)
Family trees, particularly those in a limited geographic area, tend to converge relatively rapidly and many family trees going back ten generations or more will connect to more than one dozen U.S. Presidents, if all female ancestors and their descendants are traced