Not Possible

Riddle: Two girls were born to the same mother, on the same day, at the same time, in the same month, and in the same year, however, they're not twins. How is this possible?

Answer: The two girls are a part of a set of triplets. Source: https://riddles.com/10592

Two girls were born to the same mother, on the same day, at the same time, in the same month, and in the same year, however, they're not twins. How is this possible? — Not Possible by kanish Riddle