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Wow, what a story. It also lead me to read the related article [1]. I remember the highway incident from when it happened, but not the circumstances and aftermath. In some ways is even more bizarre (and tragic).

1: https://en.wikipedia.org/wiki/Ursula_and_Sabina_Eriksson

Pretty decent profile:

https://lithub.com/i-found-a-rare-copy-of-june-allison-gibbo...

That is quite remarkable. I'd never heard of them.

the crazy part about twins only speaking to each other, is that it happens more often then one would think. I've seen a tv report about a pair of twin-girls who also only spoke to each other and they had to film them secretly just so people believed that they could speak! (except of course the parents knew)

And I read a famous novel about such twins, Le grand cahier (The notebook, Das grosse Heft) by Ágota Kristóf.

They did speak to outsiders, but made up their own logical and esp. moral rules how to treat them, and they write down their findings, when they can eliminate all personal interpretations and feelings. Everything must be objectively true, to them and their limited view.