Love those quotes, but I grew up in the "rarely" group of the first quote.

I look at #1 and believe that even living in the same house, rarely do all grow up under the same roof
and
that proves quote #3

What is "normal" for one family may seem completely wacky to another family, so that quote is "spot on".

The Richard Bach quote is true, too, b/c children can live their growing-up years in the same house with the same parents, but birth order makes it different for each of them. I know this from experience: as the oldest of three daughters, more was expected from me, but I also got to do more. Plus, my parents learned what NOT to let my younger sisters do! LOL