DTG - As I mentioned in previous threads, when I was 18 my mum revealed my 'true' ancestry on her side,
and I discovered I had a Jewish grandad of Eastern European decent
[ who I would never have any contact with, to avoid family upset ].

All my mum knew was that he was probably born in England,
but his parents came here escaping a pogram.
They might have been Russian or Polish.

History makes such details vague, and ever shifting national borders can become meaningless.

Much later, a few years before she died, my sister became an early recreational internet adopter,
and hooked up with a Jewish family tree network.
So now I know fairly certainly that they were Polish, but....????