TRAIT EXPRESSION AND THE EXPERIENCE OF LIFE
Well, any genetic expression is probabilistic over the past six generations of either side of the family – combined. So while we should see something on the order of 50% clearly, 60-80% less cleary, the combination of probabilities and in-utero developmental variation for an infinite number of reasons, the result is that expressed traits are almost entirely genetic – and even extremes like traumas will simply reflect the intersection of those traits with the severity of the trauma.
Like I’ve said repeatedly – you can largely only screw up your kids, and by high investment parenting train that genetic consequence of your reproduction such that he or she is better able to discover, pursue, and sieze opportunities for discounts and premiums on life experiences.
In other words, marrying and reproducing well is really your optimum control over the quality of both your adult life as a parent, and the lives of your children including their life as a parent.
Marrying well is why some families have been wealthy for almost a thousand years.