My Granfather Ioseb Djugashvili was the firstborn chd of Tsarina Alexandra Feodorova the Romanov, the most recent Monarch of Russia.
He was a legitimate Romanov, with his father Besaronis surname, but ineligible to be a Romanov Royal due to the circumstances of the pregnancy.
His legitimate biological children were also legitimate Romanov's, but ineligible to be Romanov Royalty of Russia.
I am Ioseb's only legitimate grandchild. Technically eigible to become a Royal Romanov under the Russian Constitutional Monarchy version of a "Great-Grandchild Rule".
The Constitutional Monarchy of Russia (my Romanov family) has never officially been delcared permanently defunct. It was listed as "presumed permanently vacant" after 1916. I became the only possible next Romanov Royal in the 1970's. It was confirmed when my Grandfather added me to his estate as a beneficiary in 1975, when I was 3.
My technical eligibility was confirmed officially at Russia's end in January 2023.