Try searching for the "Pygmalion Effect on children ", it covers the general principle. (I suggest ignoring the Wikipedia article as it is very narrowly focused.)
I read the Grit book and it talked about having high expectations. I had never heard of this Pygmalion effect before. Thank you for sharing. Here is the article I just found on it
https://www.wisdomtimes.com/blog/the-pygmalion-effect-at-hom...
If you can suggest a better one, I would be grateful.