Leaps And Bounds
The chances of being born on February 29 are (very close to) 1 in 1,461. That makes leap-year babies somewhat rare. When do people born on February 29 celebrate their birthday, especially in non-leap years?
Kibbud Av VaEm
Which Twin Is the Older Brother
Whether the twin born first or the one who becomes bar mitzvah first counts as the older brother for honoring an older sibling and for yibum.