[6ren]

I'm not clear which two "groups" you mean, or that they'd divide.

There is a class divide for human "breeding", with expressions like "marrying below" etc. But more importantly, people marry people they meet, who tend to be in their social group. So I guess this does come down to a class "race".

Aside: I expect specific surnames having the same economic value over time is a consequence of that class strata having the same value over time. i.e. it's the class, not the specific lineage. But I agree that if was due to the lineage, not the class, it would indicate something else passed on (money, influence etc) other than genetics. Of course, in practice all these factors are present to some degree and hard to disentangle.

Tangent: I think many people take political solace in us all being genetically more-or-less equal - but I think the true source of equality is that we can all think and exchange. We can create things that didn't exist before, solve problems we haven't seen before. I don't mean scientific breakthroughs, just the trivial problem-solving we all do, every day, to function. From making a joke to baking a cake. And we can communicate and trade, to combine our strengths and work together - which benefits each of us more than zero-sum conflict. Who cares who's at the "top"?

This philosophy enables aliens - of all kinds - to be "one of us" instead of "the other".