They Are Not Twins!

Riddle: Two girls have the same parents and they were born in the same year, same day, same hour and same minute. But they are not twins! How is this possible?

Answer: They were two girls from a set of triplets.

Source: https://www.riddles.com/10551

Two girls have the same parents and they were born in the same year, same day, same hour and same minute. But they are not twins! How is this possible? — They are not twins! by Jess Dess Riddle