It's a nature/Nuture divide as well.
You can see big differences in a family simply with country vs city raised cousins of a similar age group.
Sure, similar genetics but different outcomes.
Also the differences between siblings can be quite marked. So it isn't simply genetics, culture, family or society.
Our genetics alone mean we have 23 pairs of chromosomes of which on average you will share half with your siblings. And that doesn't even take into account which of the genes get activated and in which sequence.
People are highly complex machines.
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