I'll get there, one day. My late dad and late uncle didn't care so much for this, and all of grandad's stuff was chucked in a leaky old shed. I've been slowly sorting out the paperwork etc and trying to make various trails match. I'm ok with the typed documents, but the handwritten stuff is absolute murder...
My grandmother came from the Poznan area (Kalisz and Stawiszyn mainly). They were ethnic German, prominent in various local businesses (originally Jewish, though that was kept very, very quiet) who variously ended up on the wrong side of a border that migrated every few years, and eventually became Poles-by-choice. She met grandad when he was in the stockade at the tail end of WW1 and she was doing charity work.