1st cousin once removed dating
In this case, the smaller number of generations to the common ancestor is used to determine the degree, and the difference in generations determines the number of times removed.
Note that the ages of the cousins are irrelevant to the definition of the cousin relationship.
Grant, Benjamin Harrison, William Howard Taft and, of course, Theodore Roosevelt, FDR’s fifth cousin. Though both were Roosevelts, they had grown up in competing New York branches of the family, Franklin from Hyde Park and Eleanor from Oyster Bay on Long Island.
Franklin’s father James was 54 when his son was born, and chronic heart problems eventually rendered him an invalid until his death when Franklin was a teenager.
Bush were seventh cousins (four times removed), and Jimmy Carter and George Washington were ninth cousins (six times removed).
No president, however, can boast as many commander-in-chief connections as Franklin Delano Roosevelt who, by blood or marriage, was related to 11 other former presidents: John Adams, James Madison, John Quincy Adams, Martin Van Buren, William Henry Harrison, Zachary Taylor, Andrew Johnson, Ulysses S. Fifth cousins (once removed), Franklin and Eleanor had met briefly as children—although neither remembered the occasion.
If you are the same number of generations from the ancestor as your cousin, then you are first, second, third or more cousins, where the number is one less than the number of generations that you and your cousin are from the ancestor.
For example, if your nearest common ancestor is your great-grandfather, three generations away, you are second cousins.