Maybe claim 1 is true, but I still think it's badly supported here. Without having read "Unequal Chances", its subtitle "Family Background and Economic Success"

Maybe claim 1 is true, but I still think it's badly supported here. Without having read "Unequal Chances", its subtitle "Family Background and Economic Success" seems to indicate that it's not mainly concerned with personality and character issues. The least that Caplan could do is source the relevant part of this book directly, instead of linking to his own blog post, which only mentions the book in one sentence with hardly any detail. Again, about claim 2, if there is better support available, why not quote it directly? It's hardly good writing to make an important claim that requires the reader to go through reference to reference to reference and read a whole book in order to find some passage that may or may not be what Caplan's claim is based on. Regarding claim 3, I still fail to see how that has any bearing on teacher's influence on character. Even that weak claim is not supported, much less the central issue whether parental influence (presumably much stronger, at least in this context) does, or does not, affect the formation of character and personality in their children, particularly in the case when parents choose to be very intrusive.