1 in 365 – the odds of parents sharing the same birthday. 1 in 12,000 – the odds of being struck by lightning. 1 in 133,000 – the odds of both parents and child sharing the same birthday.

What are the odds of sharing a birthday with a relative?

You can test it and see mathematical probability in action! The birthday paradox, also known as the birthday problem, states that in a random group of 23 people, there is about a 50 percent chance that two people have the same birthday.

What are the chances of having the same birthday as a sibling?

The simplest model assumes that there are 365 days in a year, each sibling having the same probability of 1/365 of being born on any of those days, and their births are independent. That implies the probability that they have the same birthday is 1/365.

Is there a family that has the same birthday?

The only verified example of a family producing five single children with coincident birthdays is that of Catherine (1952), Carol (1953), Charles (1956), Claudia (1961) and Cecilia (1966), born to Carolyn and Ralph Cummins (USA) all on 20 February.

What do you call siblings born 13 months apart?

Irish twins For example, if a second babys due date is 13 months after the first child was born, being born a month prematurely would make them Irish twins. In this case, the short spacing is caused by premature birth, not the other way around.