With the London Marathon fast approaching on Sunday, Prince William, Duchess Kate and Prince Harry sat down for a candid conversation at Kensington Palace on Friday to reflect on their work with Heads Together thus far. They began the campaign one year ago in order to "end stigma around mental health," and while they have since made strides, they know there's still work left to do.
During their outdoor chat, the group revealed that Heads Together was actually Kate's idea. As she puts it, "Because it's a common thread, wasn't it? Mental health seemed to run between all the different areas we were working in."
The three touched on everything from William and Kate adjusting to life as first-time parents to how William and Harry coped with their mother, Princess Diana's, death.
"Remember the first few days with little George? You know you have no idea what you're really doing. No matter how many books your read, nothing can prepare you for it," the duchess reflected. She even reminded William of how quickly they jumped back into their everyday routine only to realize how much of a "steep learning curve" parenting would actually be.
Three peas in a pod! See William, Kate and Harry's moments together:
Prince William, Duchess Kate and Prince Harry together
Prince William, Duchess Kate and Prince Harry together
Britain's Kate, Duchess of Cambridge, and Prince Harry applaud Prince William after his speech during a training event to promote the charity Heads Together, at the Queen Elizabeth II Park in London, Britain, February 5, 2017. REUTERS/Alastair Grant/Pool
Britain's Prince William, Kate Duchess of Cambridge and Prince Harry (L) stand ready to give an award during a visit to The Mix in London, December 19, 2016. REUTERS/Alastair Grant/Pool
HAYES, UNITED KINGDOM - APRIL 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend the official opening of The Global Academy in support of Heads Together on April 20, 2017 in Hayes, England. The Global Academy is a state school founded and operated by Global, The Media & Entertainment Group, educating students for careers in broadcasting and the digital media industry. (Photo by Max Mumby/Indigo/Getty Images)
Kate Duchess of Cambridge, Prince William, and Prince Harry (R) greet guests attending the Patron's Lunch, an event to mark Britain's Queen Elizabeth's 90th birthday, in London, June 12, 2016. REUTERS/Peter Nicholls
LONDON, ENGLAND - APRIL 05: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend the Service of Hope at Westminster Abbey on April 5,2017 in London, United Kingdom. The multi-faith Service of Hope was held for the four people killed when Khalid Masood committed an act of terror in Westminster on Wednesday March 22. Survivors, bereaved families and members of the emergency services joined The Duke and Duchess of Cambridge, Prince Harry, the Home Secretary, Amber Rudd and London Mayor, Sadiq Khan, in the congregation. (Photo by Dan Kitwood/Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 05: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince Harry, Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge join a Team Heads Together London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
The Duke and Duchess of Cambridge and Prince Harry leaving the Institute of Contemporary Art in London where they outlined the next phase of their mental health Heads Together campaign.
Catherine Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry visit the Visitors Centre during the Somme centenary commemorations at the Thiepval memorial in France on July 01, 2016
The Duke and Duchess of Cambridge and Prince Harry at the Patron's Lunch in The Mall, central London in honour of the Queen's 90th birthday, in an open topped Range Rover.
Prince Harry, the Duke and Duchess of Cambridge leave St Paul's Cathedral in London following a national service of thanksgiving to celebrate the 90th birthday of Queen Elizabeth II.
Prince William, Duke of Cambridge, Prince Harry and Catherine, Duchess of Cambridge, wearing a skirt by Banana Republic and a blouse by GOAT Fashion, arrive to attend the launch of the
Heads Together campaign at Olympic Park in London on May 16, 2016
The Duke of Cambridge (left), The Duchess of Cambridge (centre) and Prince Harry (right) attend the World Premiere of Spectre, held at the Royal Albert Hall in London.
The Duke and Duchess of Cambridge and Prince Harry arriving for the annual Commonwealth Day service at Westminster Abbey, London, on Commonwealth Day.
Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry visit The Tower Of London's Ceramic Poppy installation 'Blood Swept Lands and Seas of Red' by artist Paul Cummins, commemorating the 100th anniversary of the outbreak of First World War.
The Duke and Duchess of Cambridge and Prince Harry watch riders at the finish line of Stage 1 of the Tour de France in Harrogate.
Prince Harry, the Duchess of Cambridge and the Duke of Cambridge watch a fly-past by the RAF on the balcony at Buckingham Palace following the Trooping the Colour parade, London.
Prince Harry, the Duchess and Duke of Cambridge with their wands on the set used to depict Diagon Alley in the Harry Potter Films during their visit to Warner Bros studios in Leavesden, Herts where the popular movies were produced.
The Duke and Duchess of Cambridge watch with Prince Harry during the Team Eventing Jumping Final on day four of the London Olympic Games at Greenwich Park, London.
The Duke and Duchess of Cambridge and Prince Harry chat with children during a visit to Bacon's College in Greenwich, London, where they attended the launch of a new sports project that aims to train the next generation of sports coaches.
Prince William (left), Catherine, Duchess of Cambridge and Prince Harry stand on the balcony at Buckingham Palace during the Diamond Jubilee celebrations in central London.
The Duke and Duchess of Cambridge talks to Prince Harry before a reception in the Waterloo Chamber, before her Sovereign Monarchs Jubilee lunch at Windsor Castle.
Prince William and his bride Kate leave Westminster Abbey, London, after their wedding, followed by Prince Harry (rear, left) and Pippa Middleton (rear, right).
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The conversation quickly turned to the topic of William and Harry's grieving process, with Harry admitting that though he is now encouraging young kids to be open about their grief, he and his older brother never really talked about losing their mom:
"Both of us have always been open to each other, saying we've never really talked about it. We've never really talked about losing a mum at such a young age."
Kate sweetly went on to praise them both for their strength and resilience in the face of the trauma they endured.