That’s beside the point. Look up ‘regression to the mean’. If two highly gifted parents each with an IQ of 150 have children, their children will very likely be in the upper half or even perhaps upper quarter of the IQ distribution, but very unlikely to be the top 0.025% ~ IQ of 150. That is, their kids will be above average, but likely not Ivy quality.

There’s a reason legacy admissions need a thumb on the scale.