[DiogenesKynikos]

When they immigrated to the US, they spoke German. Now, almost all their descendants speak English.

Your objection is that English is a Germanic language. That's interesting, but irrelevant here. German and English are two different languages that are mutually unintelligible, and the fact that immigrants went from speaking one to speaking the other within a few generations illustrates my point that language does not have to (and often doesn't) follow genetics.

It's not only German immigrants to the US who now speak English. Pretty much all immigrants to the US speak English after 1-2 generations, regardless of what language they originally spoke.

[mrangle]

You're out of your depth in regard to the German people example, but correct on your very simple main point.