>The most common ancestry in the US is German, not English, but English is still the dominant language. Language isn't DNA.
Their specific point is that "language isn't DNA". To support that argument they note that Continental German immigrants to America now speak English.
My specific point is that English originates not only within the language family of German speaking peoples, but that it originated with the DNA pools that comprise Northern Germany.
Therefore, I don't see how "the Germans are speaking English" makes the point that language isn't DNA.
I'm not saying that it is, at all. Its very obviously not. But the example being argued didn't make that point.