Take a look at "Transgenerational epigenetic inheritance" (https://en.wikipedia.org/wiki/Transgenerational_epigenetic_i...) and at research into how epigenetic inheritance is cited as a mechanism for passing down trauma between generations. I read about malnutrition in world war II affecting several generations but I don't remember the source, and the Wikipedia article mentions the Dutch famine
Same caveat as above: the existing studies are deeply flawed. So far, the evidence for this kind of trans-generational inheritance is very week, and there’s no plausible mechanism to explain it, either.
