Half Betting

What are the odds of being born on the same day as your sibling but in a different year?

i figure it would be more than the odds of twins, but does anyone know the actual odds? and to add on, if anyone knows the odds of both siblings being born on february 29th of a leap year?

Public Comments

1. Disregarding twins, the odds of you being born on the same day as your sibling is 1 in 365, as there are 365 days in the year. Counting leap year, which occurs once every 4 years, 1 chance in 365.25. The chances of two specific people being born on a particular day are (1/365.25)*(1/365.25) or about 1 in 133408.
2. 1/365.....??? leap year, 1/1461? I guess it depends on of your parents are TRYING or not though, because they could conceive the siblings on the same dates in different years.... this would up the odds.
3. Pretty good, if mom and dad like to make it on certain days of the week or certain holidays.... My cousins were born like different years within a certain 36 hour period. Bizarre until we figured out that that was EXACTLY 9 months after my uncle would get home after a deer huntng trip to Montana. I don't do odds, that's for Vegas (Dan Tanna, are you out there?)
4. The date that people are born is not a random event. Actuary records show that certain times of the year produce many more babies than others. If you take a group of 50 people, it is not uncommon to find at least one pair with a shared birthday. If babies were as random as the flip of a coin then the odds of 1/365 looks pretty good. Twins are not random either, twining is an inherited trait characteristic. If you come from a family tree that has no twins, the odds of one happening now is extremely low. FYI i share the same birthday as my mom...