This means that Seth was Russian.
Yes he was a RUSSIAN Jew. His Grand parents or Great Grand Parents probably came to america in the great wave of Jewish immmergration in 1880 to 1920.
Most of them were escaping the Czar’s of Russia and Progroms. Heck my Great Grand Father left Russia in 1882 and settled in St. Louis, MO. So did the Great Grand father on my Mother’s side of the family. I guess that I’m Russian too.