Coincidence???

Hello all, how are you?
Ok this is strange ..my parents birthdays are on the same day..three years apart but on the same day.
Growing up i thought all parents had their birthdays on the same day.
It was only when i went to school i was shocked to find this is not the case.
Now, when i met my hubby i went to meet his parents, lovely people..,and i could not have asked for better in-laws to be honest.
So imagine my surprise to find out that they also have a birthday on the same day as each other..three years apart again.
Now how often do you think that coincidence happens. Not very i bet.
sara