Not saying allied, but had an agreement that lasted until the nazis betrayed them. But equalling that saying this is the same as holocaust denial plays holocaust denialism down.
To me it seems that the polish wanted independence, but I don't know much about this conflict, so I am not really comfortable to comment on that.
Fighting nazis was a good thing and the appeasement politic from western nations was a bad take, I would never argue against that, but I don't know how the NAP helped, because for me it semms more like it gave the nazis time and space to make atrocitys in Europe and German.
Sorry to hear that this happens to your family. War is hell an leaves it scars. Hope your family can heal.
Seems my Geographie is rusted, got it mixed up