My Great-Grandfather:
Prince Sebastian Habsburg.
The Final Prince of the Habsburg Monarchy.
He Declined Becoming the Next Emperor of Austria-Hungary at Age 21.

Captain of the Maiden Voyage of the "Titanic" Under the Pseudonym "Ed J Smith".

There was NEVER a successor to Emperor Franz-Joseph 1 of Hungary & Austria. That is why the Habsburg Monarchy was dissolved as the Constitutional Monarchy of Hungary & Austria.

Einstein's younger half-brother (the Impostor Successor-to-be Charles) was never illegally made Emperor in any way (and was not eligible for the Habsburg Royal Family). The idea that he was coronated in some way is organized crime fiction, by people pretending my Webb Family's Habsburg Royal Estate is "up for theft", because it is still illegally withheld from my Webb family.

It has been since illegally withheld since 1960 when Prince Sebastian died.