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7. Royals Must Refer to Each Other in Public by Their Correct Titles

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Reason: Honoring the position and responsibilities of the royal family by using appropriate titles
An exception would be in a private situation with family members.
The royal family may be a close-knit family in private, but they have formalities to follow while they are in public. Rather than utilizing slang terms or colloquial terms, they address one another using their formal titles and etiquette.
In public, royals should address each other with appropriate titles. © Karwai Tang/Getty Images
By upholding the royal family's status and functions, this protocol serves to maintain the public's formal perception of the monarchy. They can (and do) use lovable nicknames or personal names in private or among close family members.