While the original Star Wars trilogy will always be remembered first and foremost for the big twist revealing the relationship between Darth Vader and Luke Skywalker, there was also a second Skywalker family twist that few people saw coming. The revelation that Luke and Princess Leia were actually siblings.
Recently, Mark Hamill responded to a fan on Twitter, and revealed that when the actors themselves learned about the twist, it spawned a on going joke between the two that would continue for years to come.
It seems Carrie Fisher quite enjoyed being Star Wars royalty, and either didn't want to share, or just enjoyed telling Mark Hamill that he didn't get to join the club. Considering the sort of friendship that the two apparently had, it was likely the latter.
To be fair, I'm not sure that Carrie Fisher was entirely wrong here. Leia was a princess of Alderaan but was adopted, so her having a sibling shouldn't matter when it comes to the family line. Luke and Leia's mother was a Queen of Naboo, that is true, but on that planet the position of Queen was actually an elected position, not one that came about via bloodline. And Amidala wasn't even Queen when her kids were born, she was a senator of the Galactic Republic.
As far as Lord Vader goes. That title was clearly honorary and did not denote any actual royal position. He was a Lord of the Sith, after all. Since the Sith are only supposed to have two positions, a master and an apprentice, it's not even clear what Vader was actually supposed to be a lord over.
So I'm pretty sure that Luke Skywalker really was just a commoner, though the title of Jedi Knight is nothing to sneeze at.
Still, one can imagine Carrie Fisher frustratingly, and hilariously, putting up with Mark Hamill's various arguments over the years as to why his character should be considered royalty.
While Hamill and Fisher may have been siblings on screen they were clearly close friends off and the loss of the actress has weighed heavily on him. He still continues to remember her and speak openly about her over two years after her death. He must miss asking her questions about his royal status.
While we thought we were witnessing Carrie Fisher's final performance in Star Wars: The Last Jedi, we know now that wasn't the case. The actress will return in Star Wars: The Rise of Skywalker via the use of inserting unused footage from the previous films in the trilogy. Exactly how that will work remains to be seen, but Fisher was seen in the Episode IX teaser trailer in a shot that's already breaking my heart.
We don't really know what The Rise of Skywalker has in store for us. Perhaps Luke Skywalker will posthumously be given a royal title. I'm sure Carrie Fisher would have loved that.