alt Hacker News> they all have the same mother, grew up in the same house, etc.
I’m pretty sure the first one didn’t have siblings, and the second only had one. Also their mother is not the same person after raising the first kid, or raising two.
Parenting never have reproducible conditions.
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An adjacent point but despite ubiquitous birth order superstitions quality literature consensus seems to be that birth order is not a large driver of predictable differences. Example:
Agree, those are some environmental differences. But any "microRNA" profile I might have contributed to the conception of each would be broadly similar. My life was pretty stable and levels of stress, diet, exercise, etc. were all about the same for all three.
I agree with what you are saying but remember the twin scenario. Spoiler alert, the kids are nonetheless different.
I have twins (a boy and a girl) and you could tell they have a completely different temperament about two weeks after birth.