I wonder about the Nazi obsession with twins. I have known some pretty horrible twins in my time.
The two I knew best used to take it in turns to torment their teachers. They were never both well-behaved at the same time.
I shared a house with a twin. He was a nice guy. I never got to know his sister. I went to their 21st. Now I wonder if behind the scenes life was not very easy for him. They were fraternal not identical twins. He was bullied about a poster he had helped produce too. I am curious about amygdala development in twins.
Famously they were said to have fought in the womb.
A famous pair of fictional twins;
What can you do if you are stuck in a womb for 9 months with a toxic sibling?
Sheldon seemed to have been bullied by his twin sister.
I realise now why so many people seemed to look at my brother askance I just noticed a young girl casting a wary look to the side. It can only have been at him. Children know things.