Royals Princess Eugenie's Son August, 1, Makes His Royal Debut for Platinum Jubilee — in a Tiny Union Jack Sweater! Although Princess Eugenie had previously shared photos of her son on Instagram, she has been careful not to show his face By Phil Boucher Phil Boucher Phil Boucher is an editor at PEOPLE and based in London. People Editorial Guidelines Published on June 5, 2022 12:28 PM Share Tweet Pin Email Princess Eugenie and August Brooksbank. Photo: Chris Jackson - WPA Pool/Getty August Brooksbank is getting into the Jubilee spirit with his first-ever royal appearance! Queen Elizabeth's great-grandson, 1, made his royal debut alongside parents Princess Eugenie and Jack Brooksbank at the Platinum Jubilee Pageant in London on Sunday. Dressed in a blue sweater with a Union Jack motif from royal favorite childrenswear shop Trotters, the tiny royal happily bounced on his mom's knee as the varied procession of musicians, dancers, acrobats and carnival floats passed by the royal box outside Buckingham Palace. Eugenie and Jack welcomed their first child in Feb. 2021. He is the ninth great-grandchild for the Queen and Prince Philip, and the first grandchild for Eugenie's parents. Although Princess Eugenie has shared a number of photos of August on Instagram, she has been careful not to show his face. Princess Eugenie Shares Personal Photos from Her Son August's First Trooping the Colour Experience Princess Eugenie and Jack Brooksbank with August. Chris Jackson - WPA Pool/Getty Eugenie's sister, Princess Beatrice, and Beatrice's husband, Edoardo Mapelli Mozzi, brought Mapelli Mozzi's son from a previous relationship to enjoy the festivities. Christopher Woolf, known as "Wolfie," stepped out for his first royal event. The couple left their daughter, 8-month-old Sienna Elizabeth, at home. For more on the Queen's Platinum Jubilee, listen below to our daily podcast PEOPLE Every Day. Beatrice and Edoardo's July 2020 wedding (where Wolfie had the important role of pageboy!) marked the first time since Camilla, Duchess of Cornwall married Prince Charles in 2005 that a member of the British royal family stepped into the position of stepmother. Beatrice is the first of her generation — and first grandchild of the monarch — to do so. "Beatrice is a wonderful and very hands-on stepmom," a source previously told PEOPLE. Princess Beatrice, Princess Eugenie, Wolfie and Edoardo Mapelli Mozzi. Ben Stansall - WPA Pool/Getty On Thursday, August enjoyed his first Trooping the Colour, watching the flypast by the Royal Air Force in the arms of Jack. Prince George, 8, Princess Charlotte, 7, and Prince Louis, 4, also got into the carnival spirit on Sunday, with the parade led by the Gold State Carriage featuring a video image of the Queen waving to the crowds on her coronation day in 1953. Can't get enough of PEOPLE's Royals coverage? Sign up for our free Royals newsletter to get the latest updates on Kate Middleton, Meghan Markle and more! Prince Louis, Princess Charlotte and Prince George. Chris Jackson - WPA Pool/Getty Mia, 8, and Lena Tindall, 3 — the daughters of Zara Tindall, Princess Anne's daughter — also enjoyed the spectacle of 10,000 performers celebrating on the streets of London drawn from across the U.K. and Commonwealth and comprised of volunteers, performers, key workers and figures from music, film, sports and the arts.