it's prob just wonky translation? since some part of the translation also didn't make sense but we'd need to check the raws :/
Okay, both Pryde and Tiara are the Queen and Prince Consort's biological children. However, the firstborn child is not guaranteed the throne in their kingdom.
The Queen doesn't want to name Pryde as heir because she's been repeatedly assaulted by visions of Pryde torturing people for the past six years. She has several visions a month (not all about Pryde), and literally ALL of her visions come true, so she has reason. (There is no easy "if she raised Pryde better, she wouldn't be like this." No matter how much the fandom may wish otherwise.)
However, the special ability to see the future is treated as a Revelation of the Future Monarch. So no matter where they are in the line of succession, or whether they're considered suitable to rule, if a person has the Royal Family's special ability of Precognition, they're the future Queen.
This is maybe some little problem for me, but this is actually some way you tried to judge the children in different each other.
For the vice captain to call Pride with just "Princess Pride", and her sister Tiara with "Her Royal Highness."
Is Pride not the child born from the Queen the rule and her husband?? Or just a child that born fron the Queen with her gigolo concubine?
Or the status of Tiara is more highest then Pride her-self?? If the two a born from the same parent (male and female) why the vice captaid call the two different way??
Sorry if i'm to sensitive.
The villain is actually the child of Royal too.
Or actually there is some rule with i'm too ignorant to know??
Please enlightent me if i'm wrong...