Together with their wives, Princes William and Harry were spotted in a surprise joint appearance, but sources claim the reunion occurred after 'extended negotiations'.
In an unexpected showing, the Fab Four reunited on Saturday at Windsor Castle as the royals viewed tributes to Queen Elizabeth II and met with well-wishers.
The walkabout followed a 45 minute delay due to behind-the-scenes talks between both camps, The Times reports. The awkward truce comes after the brothers reportedly spent no time together during the Platinum Jubilee.
Hours after their father was declared king, the Royal Family members emerged from a car behind the gates of Windsor Castle and walked to meet cheering crowds and view the flowers left outside.
A Kensington Palace spokesperson added that William had invited Harry and Meghan to join him and Kate during yesterday evening's walkabout.
A royal source said: "The Prince of Wales invited the Duke and Duchess to join him and the Princess of Wales. The Prince of Wales thought it was an important show of unity at an incredibly difficult time for the family."
But there were "extended negotiations" between the camps, claim sources, that delayed their arrival by 45 minutes. What's more, royal journalist Omid Scobie, later said on Twitter that the invitation was made at the "11th hour".
Talking about the olive branch extended to the Sussexes's: "It is, without a doubt, a significant moment in the history of the relationship between the two brothers."
The two couples were last seen at the same event during the Queen's Platinum Jubilee celebrations, where they attended the thanksgiving celebrations.
The surprise appearance is the first time the two couples have all been pictured in public together since Commonwealth Day on March 9, 2020.
William and Harry were last photographed when opening the memorial honouring their mother, Princess Diana, in July last year.
The walk came hours after William expressed his grief at the loss of his 'Grannie' in a moving statement.
He wrote: "On Thursday, the world lost an extraordinary leader, whose commitment to the country, the realms and the Commonwealth was absolute. So much will be said in the days ahead about the meaning of her historic reign.
"I, however, have lost a grandmother. And while I will grieve her loss, I also feel incredibly grateful. I have had the benefit of the Queen’s wisdom and reassurance into my fifth decade.
"My wife has had twenty years of her guidance and support. My three children have got to spend holidays with her and create memories that will last their whole lives."
In a remark alluding to the loss of his and Harry's mother, Diana, William continued: "She was by my side at my happiest moments. And she was by my side during the saddest days of my life."
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