I've come across variations of this conclusion many times now: That it is really your parents affluence and educational background that predicts your success in school and how much you will earn in the future. This is often portrayed as being unjust. To me it always seemed obvious that children with affluent and well educated parents are more likely to be intelligent, have good self-control and other traits that are…
I think by far the most important traits are cultural and behavioural.
'Intelligence' is a small thing.
Grit, self-discipline, conscientiousness, curiosity, disposition, manners, curiosity, ethics, integrity, attitude towards education, planning for the future, views towards family etc. etc. I think are far more important than raw intelligence.
Of course if your parents are CEO's in industry, they're going to expose you to that and the frame of mind necessary, much like so many actors parents are also actors/directors/creatives etc..