By telling them to grow up ! Your parents were too young to even have known much about Hitler. That's pretty lame and stupid. Tell them to grow up and read their history book ! Other than that? Just ignore them.
I'm German, which is cool to me, except some people ask me rude questions like, "did your family obey Hitler" and stuff like that. How can I respond to that?
Don't let it bother you. Let it humor you. Use it like armor. Be like "If you don't shut up, I'll stick you in the oven". Once you use it as armor, nothing can really hurt you.
-Tyrion Lannister
Ignore or asked if their families obeyed him. He had millions of different "RACES" murdered.
Id have said: "Never heard of the guy"
Why not just say, "I doubt it."
I suspect that is a true statement and hardly one that they can argue with.
This is more about "stroke exchange" rather than about them wanting (or caring) the actual position of your family.