I think the Duke and Camilla are calm because Rania is too sus. She showed herself at the birthday party, no previous contact or even a letter of intention. She made it very public. Even if they don't speak of it, those hints live in their subconscious.
The bracelet was also a precious gift meant to commemorate Ludvig's birth, it's not the type of gift that one gives away to a daughter to wear. It would be more believable to use it as a token of proof, not wear it.
I think the Duke and Camilla are calm because Rania is too sus. She showed herself at the birthday party, no previous contact or even a letter of intention. She made it very public. Even if they don't speak of it, those hints live in their subconscious.
The bracelet was also a precious gift meant to commemorate Ludvig's birth, it's not the type of gift that one gives away to a daughter to wear. It would be more believable to use it as a token of proof, not wear it.