Yes! That?s the core of the story.
Now a days Twins or multiple births are people wo have this ?special bond?
But what happends when everybody is like this?
It?s the psychology of people feeling threatened by the ones who are most close to themselfs.
Because striving for feeling unique is a characteristic of human nature.
Envy and feeling less then the other is a very importent theme in this story.

It?s the big ?what if? And what does it take for people to turn against the other.

I think I got lost along the way with this concept because i got distracted with the idea of making it a ?selling story?

Thank you for noticing the point, and making me aware of the true core of this story.

Thanks for your comments, very usefull!
I wanted it to call ?survival of the fittest? but that would make people think of the hunger games.
So I used the words ?Natural balance?
But is makes you think the same.
And It is definitly not at all the same kind a story.

I?m Dutch, so I?m a bit struggling with the right words.
But I definitely understand what you are telling me.
I will work on that!