Is This a Twin Thing?

Since the girls started playing with baby dolls, they have always put two to a stroller or two to a bed. I've always found it interesting. Sometimes they will even say something like, look mommy I'm just like you or it's like me and sissy.

I'm not sure if singletons play the same way or not. But I think it still shows the special bond that these two little girls have. It's like I've always said, raising twins is like a social and science experiment.