This is almost 80%true and true for any other thing, A child's upbringing has direct effect on their adulthood(life). As an adult, you learn what you where never taught or you unlearn what you knew, likewise relearn.
You can't learn everything as a child but the base or background matters alot.
As for someone's children, teaching them what you wished you were taught is a gateway to a better adulthood financially and otherwise
That's right, we cannot learn everything as a child but life experience will teach the most of us. If we've been guided somehow during our childhood, we'll eventually remember it. Otherwise, we have to deal with it on our own without guidance, but that experience is the best teacher in our lives. Especially if it's about the finances that we need to manage. Just like my parents taught me when I was younger, they have taught me the importance of financial literacy. I just ignored it a long time ago until I grew up and became older, remembering the tips they've given me.