Well, your comment confuses the facts, let's sort this out for other members.
LF (the grandfather) did try to be refunded for expropriates possesions from 1945 while the then existing law (VermG) of the Russian occupier in East Germany did NOT apply for it.
Of course his claim was turned down before one could call it a case.
The law endured the fall of the Berlin wall and East German Republic.
GF (the grandson and still head of the house now) is the one who
like you put it "had legal issues with his uncles" (who had survived his father) after the death of LF.
Truth here: the uncle Friedrich Wilhem lived a morganatic marriage which disinherited him, which he tried to fight but lost in court
GF then in 2014 claimed possions, mostly art, two castles and right of residence
for two castles in Berlin.
His (GF') claims were legally accepted as based on the then (2014) and still existing law (EALG) applys to it.
UNLESS your ancestor (crucial here CP Wilhelm from Prussia, LF's father) had given considerable encouragement to Nazi regime. Which was the big question here.
At first ongoing behind the scenes negotiations and during the last years widely public discussions but court dispute took place for almost 10 years until GF now turned the claims down.
I hope GF finds his peace now with the situation. Luckily his grandfathers reputation was not crucial for the claims because though LF ran the story of being close to the resistance(never proofed but doubted) his role is interpretated not much better than his fathers CP Wilhelm
and as LF raised GF (whose father had died shortly after GF's birth) it had been much harder emotionally and I think the historians plus the media would have pointed out all the details and probably hurt GF and both ruined the prussian reputation for all times.
