Not sure who is who?
There was a pair of twins in my grade school that were very identical and also inseparable. This meant that people began to see the two of them as one entity. This also meant that they were easily mistaken for each other by both teacher and the other students. They also used to get in trouble by acting out in class a lot. I wouldn’t be surprised if they didn’t pull the same trick of switching with each other in their classes at school.