Also, in response to Marsha's maybe you can explain it better, but iirc not all Jews are Jews in the way we tend to think about DNA. Tradition is that you're not technically Jewish unless your mother is Jewish. It passes through the maternal bloodline iirc. My mother's great grandparents were Jewish, but even though her grandfather was Jewish, it didn't pass to her dad, or herself. If it could pass either side, I'd be 1/8th bia bloodline.