Learning about WWII doesn’t teach you how the most progressive, industrialized society in the world at the time, and possibly ever, became fascist. For that you need to learn about WWI, the failed Spartacist uprising from 1917-1923, and the following period where the Nazis rose to power and the last remnants of the USPD and KPD were destroyed.

So unless your uncle is a fan of Rosa Luxemburg, he’s probably clueless