>>9703258they actually do for the most part. Look into edward duttons work.
Genes are also not a uniform expression in children. For example if your entire genetic line has blonde hair except for your great great grandfather. It is not guaranteed that your children will all have blonde hair (just more likely) your great great grandfathers genes are still in your collective genepool so that means its possible to have a child with brown hair (just a lot less likely depending on that genes dominance and reoccurance).
This also works similarly with genetic traits such as height and even behavioral patterns like outgroup or in group preference.
This is why even ethnocentric families such as George Lincoln Rockwell or Heinrech Himmler can have one or two kids that didn't inherit those ethnocentric genes or inherited genes from latent ancestors that made them prefer outgroup.
If you look at the rest of Rockwells and Himmlers kids (besides their one racemixing daughter) they all married white people.
This type of cherrypicking doesn't really make good arguments for your opinion on nurture vs nature.
