Question

a boy and a girl born on a same day of the same year with the same parents are not twins. how is this possible

Answer 1

According to the circumstances mentioned in this riddle like question,the most possible answer is the day is referring to the days of a week (Monday to Sunday) not the date.

For example :

The first child was born on a monday,date = x.

And due to pregnancy complexity the second child was born on the next monday, date = x+7.

Here the day is same which is monday but not the date.

Answer 2

Answer:

They are two of set of triplets or more