This isn’t even close to being accurate depending on the economic status and upbringing. I’ve met only children on both sides of the spectrum and in between.https://twitter.com/itsonlytwiterr/status/1125375833747722242 …
Bring raised with siblings doesn’t matter that much as adults I’ve found. Once you’re in high school and you start making friends, you basically become reraised to an extent. Life ends up instilling traits into you and you see real world application and adjust if necessary.