the children of modern minor aristocracy all have PhDs, but still can't ward off the untutored genius

In the old days, even when you became a hereditary aristocrat because you sort of 'earned' your great power and wealth by your sheer talent, drive and aggression, deep down you knew it was very unlikely your kids and grandkids were going exhibit all that drive.

In part because growing up wealthy and established tends to take the edge off of drive and aggression.

So in the past, for tens of thousands of years, you ensured your dumber and lazier kids and grands would share in your own achievements long after you were dead by investing in lands, lots of it.