Soft skills, have been shown to be a higher predictor of income than IQ.

You are right that something's been passed down - but it's not the genes. It's the social connection to:

* Get jobs without applying for them.

* To learn important economic news before anyone hears them. E.g. President bought 1200 Cuban cigar just before banning imports from CUBA. Read this: https://www.cigaraficionado.com/index.php/article/great-mome...

* To get contracts regardless of ones qualifications. I've read that Aristocrats ensure their kids have ivy league degrees to maintain a illusion of fairness.

There's an article I read here on HN that says, Ivy league schools are successful because they select applicants who would be successful without them.

If genetics doesn't affect income, why is there a correlation between identical twins raised separately?

See e.g. https://helda.helsinki.fi/bitstream/handle/10138/38881/HECER...

It wasn't stated there is no effect, just that social class has a larger impact at the highest rungs of society.

>You are right that something's been passed down - but it's not the genes.

That sounds like a claim that there's no causal connection running through genes.