A and S are identical. There are differences but you have to know about them. A has a double crown and a little blue mark on her nose. S makes S faces, and is slightly smaller. But if you don't know that, you might be excused finding it difficult to tell who's who.
B and I can now (since about their first birthday) pretty much always tell the difference straight away. They just each do things that are totally themselves. A is incredibly kind. S is incredibly cheeky. A can stand up on her own; S watches. S can go downstairs backwards; A sits at the top and whinges. And for those that don't know? Well, I dress them differently, and I'm quite happy to explain that S is wearing red and A purple, or whatever.
But L still can't tell. She calls them "my sister" or "that one". Or says "is that one S?" and when I say "no", says "that one?", as though there were more than two options. I thought that this was an age thing. She's only little after all.
But her friend F, at the advanced age of just 3, knows. And he knows all the time. In fact, he corrected me yesterday when I got them wrong.
Which leads me to wonder - is she doing it on purpose?