Speculation surrounding the relationship between Meghan Markle and Kate Middleton has swirled over the last five years with the bombshell Oprah Winfrey interview stoking further rumours of a rift.
The Jubilee celebrations were the first time they were together since the Duchess of Sussex accused her sister-in-law of making her cry over bridesmaids' dresses, the Mirror reports.
After their first meeting in 2017, relations initially seemed friendly. However, issues have raised in recent years. While royal fans hoped the women would become strong friends, countless reports over the years suggest there have been tensions -with one insider simply saying they are "very different".
Here's a look at the relationship between the sisters-in-law.
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First meeting
When Harry and Meghan returned from a trip abroad in 2017, they travelled to Kensington Palace so Markle could finally meet Kate, Omid Scobie and Carolyn Durand claimed in 'Finding Freedom'.
During this meeting, Meghan gifted Kate a leather notebook as a late birthday present, and the meeting ended with Kate letting her know she could contact her if she needed anything.
In the Oprah interview, Prince Harry said his family, including Kate, embraced Meghan, adding: "You know, my father, my brother, Kate and the rest of the family [they]...were really welcoming."
Engagement
When asked about Harry and Meghan's engagement, Kate shared her delight, as she told reporters that William and she were "absolutely thrilled."
The couple were then photographed with Harry and Meghan for the first time when the Queen invited Meghan to attend the church service at Christmas.
Royal event
The couple then came together to talk about their plans for the Royal Foundation in 2018 and their joint charitable projects.
As part of the Q&A session, the royals were asked about the challenges of having to work alongside family.
At the event Prince Harry admitted: "Working with family does have its challenges, but we’re stuck together for the rest of our lives," before Meghan added: "Togetherness at its finest."
Bridesmaid feud
Meghan and Prince Harry made a number of claims about their time as working members of the Royal Family - with claims swirling beforehand that Meghan made Kate cry during a bridesmaid dress fitting.
But during her one-on-one with Oprah, Meghan claimed it was actually Kate that made her cry.
In Andrew Morton's book Meghan: A Hollywood Princess, the author claimed that Kate didn't have "much energy" to bond with Meghan in the lead up to the wedding as she was going through a difficult pregnancy with Louis.
Meghan said she has now forgiven Kate, adding that she's a "good person" and that Kate sent her flowers to apologise for the incident - although gave no details on what sparked the incident, and it is still not known for certain.
She also called Middleton a "good person" and added: "If you love me, you don't have to hate her. And if you love her, you don't have to hate me."
In Andrew Morton's book, he claimed that after the much-discussed row, Meghan bought Kate a bracelet to thank her for her help, after the spat.
Morton describes the gold piece of jewellery, by Californian jeweller Lisette Polny, as an "elegant peace offering".
He wrote: "The spat concerning the bridesmaids’ outfits now behind them, Meghan had since given Kate and her six closest friends gold bracelets designed by Californian jeweller Lisette Polny as a thank-you for their help and support."
Final royal engagement together
All eyes were on Meghan Markle and Prince Harry as they took their seats in Westminster Abbey for their final royal engagment.
The couple joined the Queen, Prince Charles, Camilla and the Duke and Duchess of Cambridge at the Commonwealth Day Service just days before they officially stepped down as senior royals.
People were particularly interested to see how the Fab Four interacted following countless rumours of a fallout between Diana's two sons and their wives.
But there was very little interaction between the couples, and Harry and Megan left for Canada after.
Missed opportunity
Earlier this year, Prince Harry and Meghan Markle made a secret trip to the UK where they met the Queen and Prince Charles for 'clear the air' talks.
It was the first time that Meghan had been back in the country since quitting as a senior royal in early 2020, as the pair were on their way to the Invictus Games
But William and Kate missed these chats, which royal expert Robert Jobson dubbed "significant".
He told the Mirror: "Significantly, Prince William and Catherine were not involved in these ‘clear the air’ chats.
Reunited
Both couples arrived at St Paul’s on Friday. The Duke and Duchess of Sussex were greeted at the great west door by the Dean of St Paul’s.
They spent a few minutes talking to the senior cleric before they entered the place of worship and proceeded to greet the long line of clergy who are taking part in today’s service of Thanksgiving.
Harry stopped to chat for a few moments with the Archbishop of York who later will give the sermon and is expected to praise the Queen’s 70-year reign.
Earlier this year, a royal expert claimed The Duchess of Cambridge would "not forget" how she was treated by her sister-in-law following her bombshell Oprah Winfrey interview.
Royal author and editor-in-chief of Majesty Magazine, Ingrid Seward previously warned Kate may never forget how she was treated.
She told the Mirror: "The Duchess of Cambridge will be cordial to Meghan. She will be sure to be photographed kissing or hugging her. She has to - that is part of her job. Her private feelings have to remain just that.
"Kate will not forget however how Meghan treated her. But she knows there is no point in prolonging a feud that has the opportunity of being repaired. The Platinum Jubilee is just that chance.
Another royal commentator has said that Meghan and Harry hope to be as “low-profile as possible” during their trip to the UK for The Platinum Jubilee.
Lilibet and Archie are not set to attend any public events but it has emerged that their daughter, who turns one tomorrow, may have had the chance to meet the Queen for the first time last night.
Omid Scobie, the author of Finding Freedom, told BBC Breakfast: “I spoke with people close to the couple… who said that they want to be as low-profile as possible during this trip.
“It’s almost hard to believe, but I think yesterday Trooping the Colour was a great example. We didn’t really catch sight of them on TV cameras.”
He added that the couple hold a “warm and close” relationship with The Queen.
He also spoke about Lilibet’s upcoming first birthday on June 4.
He said: “Those moments with Lilibet are very much private between them and the Queen” and that last evening at Windsor would have been the first time Her Majesty would have met her namesake in person.
