Natural aptitude occurs in a similar percentage of children from all backgrounds
As Wikipedia would say, "citation needed". There's no worthwhile evidence that's true. Such evidence as there might be involved inter- and immediately post-war twins studies, back when there were a lot more infant adoptions and a rather more callous attitude to families being kept together. Unfortunately, because Cyril Burt was a charlatan with a bee in his bonnet, his evidence is utterly untrustworthy. He contaminated the evidence base, and we can't do the experiments again because it would be wildly, wildly unethical.
We aren't surprised that Liz McColgan's daughter is an Olympic-standard athlete, that Nigel Clough and Frank Lampard are quite good at footy, or that Teddy and Kami Thompson can hold a tune; that the latter is in a band with her husband shows a great deal of bravery given how it ended up for mum and dad. We aren't puzzled that Carrie Fisher or Melanie Griffiths or Jane Fonda or (after a fashion) Keifer Sutherland can act, either. And for a greater concentration, I think there's been at least one son of a former F1 driver on the F1 grid for the past 26 years, at peak I think three or maybe even four, and most of them have been at least as quick as their fathers (Max Verstappen's mother was very quick too). Nature, nurture or opportunity? Ah, if only there were an ethical way to find out.
But quite why we express no surprise when athletes, musicians and actors have children who follow in their footsteps, but cling to the idea that intelligence isn't hereditary, I don't know. Even if it's all nurture, since we aren't proposing to put children in orphanages or have them randomly fostered, it's hard to untangle. What we do about this, and how we extend opportunity more widely, is a political question, and one where I suspect we are on the same page. But just asserting that intelligence, unlike almost every other human attribute, is a priori non-heritable because it suits our political ends, is just crazy. Lysenko shows us what happens when we subsume reality to ideology. And if intelligence is heritable, which I think on balance is more likely that not, we now live in a society with a lot of assortive mating, which is going to make the issue progressively more pressing.