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Camilla Duchess of Cornwall, Prince William and Prince Harry applaud at the live pop concert to mark the 30th Anniversary of the Prince’s Trust Charity at the Tower of London on May 20, 2006 in London, England.

SeeingQueen Camillacrowned alongsideKing Charlesoncoronation daymay be fraught forPrince WilliamandPrince Harry, whose motherPrincess Dianahad been destined for the role.

“They are likely feeling a little wobbly about it,” royal author Ingrid Seward tells PEOPLE exclusively in this week’s issue. “I think a lot of people will feel the same.”

Palace sources always insisted thatPrince William, 41, andPrince Harry, 38, who grew up with the knowledge of their father’s affair with Camilla, were welcoming to their stepmother. A family friend says “there wasn’t any animosity,” andPrince Harryvoiced support for Camilla in 2005, saying that he and William “love her to bits” and that she was “not the wicked stepmother.”

Dave J Hogan/Getty

Prince William, Duke of Cambridge, Camilla, Duchess of Cornwall, Charles, Prince of Wales and Prince Harry attend the Opening Ceremony of the Invictus Games at Olympic Park on September 10, 2014 in London, England.

However, in his sweeping memoirSpare, released earlier this year, the Duke of Sussex wrote that he andPrince Williamwere glad their father found happiness butdidn’t want Charles to marry Camilla.Prince Harryalso accused Camilla ofleaking detailsof private conversations to the press.

Despite the controversy, some say Camilla, 75, has earned her place as Queen alongside King Charles, 74.

“She has done a lot to show she is prepared for it and has a right to be in the modern world,” biographer Sally Bedell Smith tells PEOPLE. “And there has never been any doubt that Charles wants her there as Queen.” Seward adds, “William is quite calm about it. But it will stick in Harry’s throat a bit.”

King Charles and Queen Camilla.Hugo Burnand / Buckingham Palace

STRICTLY EMBARGOED UNTIL 2200HRS TUESDAY 4TH APRIL 2023 -The King and The Queen Consort - credit Hugo Burnand

Although it was announced when Charles and Camilla married in 2005 that she would be known as Princess Consort when Charles took the throne,Queen Elizabethput an end to the title speculationin Feb. 2022 as she marked the 70th anniversary of her accession. The late monarch, who died in September at age 96, wrote, “When, in the fullness of time, my son Charles becomes King, I know you will give him and his wife Camilla the same support that you have given me; and it is my sincere wish that, when that time comes,Camilla will be known as Queen Consortas she continues her own loyal service.”

Camillaspoke out for the first time about the titleshortly after the announcement during a visit to the community kitchen Nourish Hub in London.

“I feel very, very honored and very touched,” she said.

Camilla, Queen Elizabeth, Meghan Markle, Prince Harry and Prince William.Chris Jackson/Chris Jackson/Getty

Camilla and Prince William and Prince Harry

As the crowning ceremony draws near, it remains unclear if Prince Harry andMeghan Marklewill travel to the U.K. for the historic service. The Duke and Duchess of Sussex, who have resided in Meghan’s home state of California since 2020 after stepping back as senior members of the royal family,have been invitedto the event at Westminster Abbey.

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Come what may, “Queen Camilla” was not a title the one-time Camilla Parker Bowles ever imagined holding. But on May 6, she will be symbolically crowned alongside her husband at ahistoric coronationrich in tradition with modern touches.

“Considering that for most of her lifeshe’d never contemplated the idea of becoming Queen, she’s doing incredibly well,” Wilson tells PEOPLE. “It’s a hell of a challenge being permanently in the spotlight at this age, but she’s tough and can take it.”

source: people.com