Where did all that English DNA come from?

Everyone in the Snover family knew George A Sznarwakowski had been adopted by Anna and John Sznarwakowski in Detroit in the 1910s. The family story had it that George’s last name had been White before the adoption, although there’s no paperwork I can find anywhere that confirms George’s origins. He married Monica Gorzynski whose family were all Polish, and their children, including their second son, Papa – Robert Francis Snover – grew up in Detroit as Polish-Americans. So where did all that (34%) British ethnicity come from?

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