I work with a person who is a dual citizen, german and american. They are also jewish. It doesn't take much of a grasp of history to figure out some family history there.
I have another friend who was at the studio and started talking about how they were going to visit a friend of theirs who was old Austrian royalty whose family has a chateau in the south of France. It also doesn't take much knowledge of history to figure out that one.
That was an interesting day.