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Yes this is what people forget when they bring up the generational "drift". If you are reproducing within your own people, then the older and even ancient parts of the genome are passed down. It is why a White parent who race mixes and produces a non-white child is actually more "related" to a random White person on the street, than to their own offspring.

There are various studies out there that suggest the "ideal" pairings are somewhere around the third or fourth cousin level. Which is basically what you would get in a traditionally sized community or small city.