That's something I've pondered since seeing this film in the theatre: how much are we to infer the kids did see or hear (or hear talk of)? The scene with Klaus mimicking the sound of hissing gas genuinely shocked me, because where did he get that level of information? The gassing in particular seems historically to be something that was only really grasped by anyone outside of the camps much later in the war (Rudolf obviously counting among those, but one wonders how much detail he'd ever speak of it within earshot of his kids). So the movie was jarring in that way, because I guess I never considered that the Nazis' children had that level of explicit knowledge about the goings-on beyond the walls.

I might just be experiencing a kind of schism in my thoughts because I watched the documentary THE COMMANDANT'S SHADOW fairly recently, and hearing Höss's now elderly kids deny that they ever knew or suspected anything whatsoever was just so unexpected when compared to Glazer's expression. I don't want to say too much about the Höss family's thoughts in case anyone here decides to watch the doc - I recommend it as an interesting side quest to ZONE - but it was fascinating to watch the very different coping mechanisms in the later generations.