Camilla's sister has made a rare comment on King Charles and the Queen's relationship, revealing the reason behind their success.
Annabel Elliot, the Queen's younger sister, is an interior designer and antiquities dealer.
Speaking on her sister's relationship with the King, Elliot said: "They have known each other for a long time, almost their entire lives.
"Theirs, as any marriage should be, is a huge friendship."
Camilla's sister has made a rare comment on King Charles and the Queen's relationship, revealing the reason behind their success
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Elliot said: "The key thing is that there is not really anything competitive between them. She is not trying to steal his thunder in any way at all. He is the King. And she will do her best to support him and be totally loyal to him.
"She is a very strong character and she sticks to her guns.
"It’s quite extraordinary when I look back at how she has coped with everything.
"She is incredibly loyal to people she loves… She is a very straightforward person. You always know where you stand."
Queen Camilla [right] and Annabel Elliot [left] have a close relationship
PAKing Charles and Queen Camilla will mark their 20th wedding anniversary on April 9 by spending the evening as guests of honour at a black tie State Banquet hosted by Italian President Sergio Mattarella.
The Queen's sister added that the royal couple's relationship is successful due to Camilla’s "really good sense of humour".
She told the Mail: "They rather like quite a lot of things going wrong. Things going wrong on a tour, or something like that."
Elliot added that Camilla is not the best person at controlling her laughter, revealing that their father would often have to separate the siblings in church.
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Annabel Elliot is a supporter of King Charles and Queen Camilla's relationship
BBC / Oxford Film and TelevisionElliot added: "I like being part of their post-mortems afterwards, and my sister – which is quite a thing that is known to all our family – is quite prone to exaggeration.
"And so the story often gets better and better and the King will [fondly] interject, 'I’m not sure it’s quite like that darling'.
"I would almost say it’s the biggest gift she has given him.
"The humour. It’s been such a bond between them. And even if they argue, they will always laugh."
