There is no such thing as 1/3 in ancestry; all fractions have denominators which are powers of 2.
As for me, my father's ancestors came from Barcelona originally. In 1492, they were expelled from Spain by Ferdinand and Isabella for being Jewish and settled in Salonika. Many generations later, my paternal grandparents were born in Salonika when it was still part of the Ottoman Empire in the 1880's. They came to New York in 1910. (The city of their birth is now part of Greece and now named Thessaloniki.)
My mother's parents were born in the 1890's in the town of Colombia which was then in the province of Galicia of the Empire of Austria-Hungary. Her father and mother came to New York in 1910 and 1914 respectively. (That town is now part of Ukraine. It was, at various times, ruled by Poland, Russia, Germany, and Russia again.)