Thank you, ladongas, for keeping us up-to-date!
I wonder, how this story turns out. Imho Georg-Friedrich is right in seeking a decision. Especially, if one considers, that the then Ex-Emperor was still very much alive, when the pics of the Crown Prince in Nazi Regalia were taken.
So, the question is: Was the Nazi dude representing the House of Hohenzollern, or just himself? Just mho...
Of course it is Prince Georg's legal right to take it to court, just like any Mr. Schmidt or Müller does, the governments involved into this feared this and therefore tried to solve the matter with some compromise .
and of course it is an almost unsolvable case because "substantial support" is not measurable for lawyers aswell as historians cannot make legal decisions.
What this here posted english articles miss is a widely discussed detail in the matter which is that former Chancellor Kohl said the GDR insisted to keep the eastgerman land reform when agreeing to the german reunion.
Gorbatschow said this never existed! As Kohl's reputation is at its worst in Germany this is now considered to be pro Royals.
The german government is known for its unjust decisions concerning restitutions, but no government wants to deal with the Hohenzollern as you cannot explain this to the average german citizen.
The prince claims the historians did not use all of the archives the family provided for them, so this will be another issue in the future. Malinowski is "the" expert for european royalty so his word does weigh in.
If anybody knows German or would like to use google, here are the assessments made from the four historians , two pro Hohenzollern, two including Malinowski against the Hohenzollern saying Georg's great-grandfather did substantially support the Nazi regime.
Juristische Instrumente für die BRD zur Abwehr der Hohenzollern
The problem for Prince Georg is, too, that many historians call the CP a real idiot and therefore probably not capable for doing anything "substantial" , but how can the Prince nod his head to this without loosing his face.
I must admit I have seen a lot of disturbing stuff about the CP's connection to Hitler himself and the party, pictures, letters....that makes it even more difficult and politically explosive if the government or the judge restitutes the Hohenzollern family, the german people widely reject this idea. And above all there are rich families here who supported a lot (substantially ?)the Nazis and never have been charged anything .....
Time and hopefully a judge will tell, if it is just in the end, who knows, the ones who can tell have long passed away.
The one interior scene of Hohenzollern Castle is breathtaking! If one resided there, do not leave a smudge. 
