Prince William and Prince George.Photo: YUI MOK/POOL/AFP via GettyPrince Williamshowed off his playful dad side when he andKate Middletonand their two eldest children,Prince George, 9, andPrincess Charlotte, 8,joined the royal familyat Sunday’sCoronation Concert.While waving small hand-held Union Jack flags, the Prince of Wales decided to have a little fun with his children, brushing the flag against George’s face to block his view of the crowd gathered on the grounds outside Windsor Castle.William, 40, then reached across George to do the same to Charlotte, but his daughter showed off impressive reflexes as she ducked out of the way in time to dodge the flag. (Five-year-oldPrince Louisdidnot attendthe Coronation Concert, buthe was on hand for the coronation festivities Saturday.)The Wales kids put their flags to good use during the concert, waving them as they clapped along to acts. They seemed to light up when Miss Piggy and Kermit made a surprise appearance, saying they were looking for their seats in the royal box. Towards the end of the show, Kermit seemed to find his way to the box — waving a flag right in front of Prince Edward and Sophie, the Duke and Duchess of Edinburgh!RELATED PHOTOS: The Royal Kids' Cutest Coronation PhotosPrince William and Princess Charlotte.YUI MOK/POOL/AFP via GettyPrincess Charlotte also was spotted singing along toKaty Perry’s performance of “Roar” as drones in the sky formed a lion — a key part ofKing CharlesandQueen Camilla’scoats of arms.For his official duties at the concert,Prince Williamgave an emotional speech about his father — but couldn’t helpslipping into “dad” mode again with a punny joke.Taking the stage afterLionel Richieperformed, the heir to the throne began, “I want to say a few words about my father and why I believe this weekend is so important. But don’t worry, unlike Lionel, I won’t go on all night long,“he jokedin a nod to hitmaker’s 1983 smash single, “All Night Long.““As my grandmother said when she was crowned, ‘Coronations are a declaration of our hopes for the future,’ " Prince William said, quotingQueen Elizabeth’s coronation speech from 1953. “And I know she’s up there, fondly keeping an eye on us. She would be a proud mother.“Prince William in the stands with Princess Charlotte and Prince George.JONATHAN BRADY/POOL/AFP via GettyOn the subject of his father’s coronation, the prince continued, “For all that celebrations are magnificent, at the heart of the pageantry is a simple message: Service … My father’s first words on entering Westminster Abbey yesterday were a pledge of service. It was a pledge to continue to serve. Because for over 50 years, in every corner of the U.K, across the Commonwealth and around the world, he has dedicated himself to serve others, both current and future generations, and those whose memory must not be neglected.“The Prince of Wales pointed to his father’s longstanding passion for environmental conservation (something he even incorporated into the ceremony itself): “Take the natural world. He warned us of the risks to our planet’s health long before it was an everyday issue. ““Or the Prince’s Trust. It has supported over a million young people, many from disadvantaged backgrounds, to realize their ambitions,” he continued, referencing Charles' namesake charity, established 1976.Can’t get enough ofPEOPLE’s Royals coverage?Sign up for our free Royals newsletterto get the latest updates onKate Middleton,Meghan Markleand more!STEFAN ROUSSEAU/POOL/AFP via Getty"And, perhaps most importantly of all, my father has always understood that people of all faiths, all backgrounds, and all communities, deserve to be celebrated and supported,” the Prince of Wales added, emphasizing his father’s interest in and dedication to interfaith relations. “Pa, we are all so proud of you.““I also want to express my pride and gratitude for the millions of people who serve, in the forces, in classrooms, hospital wards and local communities,” William continued. “I wish I could mention you all. Your service inspires us, and tonight we celebrate you too.““I commit myself to serve you all: King, Country and Commonwealth,” he concluded. “God Save the King.”

Prince William and Prince George.Photo: YUI MOK/POOL/AFP via Getty

Britain’s Prince George of Wales (L) reacts as his father Britain’s Prince William, Prince of Wales (R) plays with a Union flag during the Coronation Concert at Windsor Castle in Windsor, west of London on May 7, 2023. - For the first time ever, the East Terrace of Windsor Castle will host a spectacular live concert that will also be seen in over 100 countries around the world. The event will be attended by 20,000 members of the public from across the UK.

Prince Williamshowed off his playful dad side when he andKate Middletonand their two eldest children,Prince George, 9, andPrincess Charlotte, 8,joined the royal familyat Sunday’sCoronation Concert.While waving small hand-held Union Jack flags, the Prince of Wales decided to have a little fun with his children, brushing the flag against George’s face to block his view of the crowd gathered on the grounds outside Windsor Castle.William, 40, then reached across George to do the same to Charlotte, but his daughter showed off impressive reflexes as she ducked out of the way in time to dodge the flag. (Five-year-oldPrince Louisdidnot attendthe Coronation Concert, buthe was on hand for the coronation festivities Saturday.)The Wales kids put their flags to good use during the concert, waving them as they clapped along to acts. They seemed to light up when Miss Piggy and Kermit made a surprise appearance, saying they were looking for their seats in the royal box. Towards the end of the show, Kermit seemed to find his way to the box — waving a flag right in front of Prince Edward and Sophie, the Duke and Duchess of Edinburgh!RELATED PHOTOS: The Royal Kids' Cutest Coronation PhotosPrince William and Princess Charlotte.YUI MOK/POOL/AFP via GettyPrincess Charlotte also was spotted singing along toKaty Perry’s performance of “Roar” as drones in the sky formed a lion — a key part ofKing CharlesandQueen Camilla’scoats of arms.For his official duties at the concert,Prince Williamgave an emotional speech about his father — but couldn’t helpslipping into “dad” mode again with a punny joke.Taking the stage afterLionel Richieperformed, the heir to the throne began, “I want to say a few words about my father and why I believe this weekend is so important. But don’t worry, unlike Lionel, I won’t go on all night long,“he jokedin a nod to hitmaker’s 1983 smash single, “All Night Long.““As my grandmother said when she was crowned, ‘Coronations are a declaration of our hopes for the future,’ " Prince William said, quotingQueen Elizabeth’s coronation speech from 1953. “And I know she’s up there, fondly keeping an eye on us. She would be a proud mother.“Prince William in the stands with Princess Charlotte and Prince George.JONATHAN BRADY/POOL/AFP via GettyOn the subject of his father’s coronation, the prince continued, “For all that celebrations are magnificent, at the heart of the pageantry is a simple message: Service … My father’s first words on entering Westminster Abbey yesterday were a pledge of service. It was a pledge to continue to serve. Because for over 50 years, in every corner of the U.K, across the Commonwealth and around the world, he has dedicated himself to serve others, both current and future generations, and those whose memory must not be neglected.“The Prince of Wales pointed to his father’s longstanding passion for environmental conservation (something he even incorporated into the ceremony itself): “Take the natural world. He warned us of the risks to our planet’s health long before it was an everyday issue. ““Or the Prince’s Trust. It has supported over a million young people, many from disadvantaged backgrounds, to realize their ambitions,” he continued, referencing Charles' namesake charity, established 1976.Can’t get enough ofPEOPLE’s Royals coverage?Sign up for our free Royals newsletterto get the latest updates onKate Middleton,Meghan Markleand more!STEFAN ROUSSEAU/POOL/AFP via Getty"And, perhaps most importantly of all, my father has always understood that people of all faiths, all backgrounds, and all communities, deserve to be celebrated and supported,” the Prince of Wales added, emphasizing his father’s interest in and dedication to interfaith relations. “Pa, we are all so proud of you.““I also want to express my pride and gratitude for the millions of people who serve, in the forces, in classrooms, hospital wards and local communities,” William continued. “I wish I could mention you all. Your service inspires us, and tonight we celebrate you too.““I commit myself to serve you all: King, Country and Commonwealth,” he concluded. “God Save the King.”

Prince Williamshowed off his playful dad side when he andKate Middletonand their two eldest children,Prince George, 9, andPrincess Charlotte, 8,joined the royal familyat Sunday’sCoronation Concert.

While waving small hand-held Union Jack flags, the Prince of Wales decided to have a little fun with his children, brushing the flag against George’s face to block his view of the crowd gathered on the grounds outside Windsor Castle.

William, 40, then reached across George to do the same to Charlotte, but his daughter showed off impressive reflexes as she ducked out of the way in time to dodge the flag. (Five-year-oldPrince Louisdidnot attendthe Coronation Concert, buthe was on hand for the coronation festivities Saturday.)

The Wales kids put their flags to good use during the concert, waving them as they clapped along to acts. They seemed to light up when Miss Piggy and Kermit made a surprise appearance, saying they were looking for their seats in the royal box. Towards the end of the show, Kermit seemed to find his way to the box — waving a flag right in front of Prince Edward and Sophie, the Duke and Duchess of Edinburgh!

RELATED PHOTOS: The Royal Kids' Cutest Coronation Photos

Prince William and Princess Charlotte.YUI MOK/POOL/AFP via Getty

Britain’s Princess Charlotte of Wales (L) reacts, watched by her brother Britain’s Prince George of Wales (C), as her father Britain’s Prince William, Prince of Wales (R) plays with a Union flag during the Coronation Concert at Windsor Castle in Windsor, west of London on May 7, 2023. - For the first time ever, the East Terrace of Windsor Castle will host a spectacular live concert that will also be seen in over 100 countries around the world. The event will be attended by 20,000 members of the public from across the UK.

Princess Charlotte also was spotted singing along toKaty Perry’s performance of “Roar” as drones in the sky formed a lion — a key part ofKing CharlesandQueen Camilla’scoats of arms.

For his official duties at the concert,Prince Williamgave an emotional speech about his father — but couldn’t helpslipping into “dad” mode again with a punny joke.

Taking the stage afterLionel Richieperformed, the heir to the throne began, “I want to say a few words about my father and why I believe this weekend is so important. But don’t worry, unlike Lionel, I won’t go on all night long,“he jokedin a nod to hitmaker’s 1983 smash single, “All Night Long.”

“As my grandmother said when she was crowned, ‘Coronations are a declaration of our hopes for the future,’ " Prince William said, quotingQueen Elizabeth’s coronation speech from 1953. “And I know she’s up there, fondly keeping an eye on us. She would be a proud mother.”

Prince William in the stands with Princess Charlotte and Prince George.JONATHAN BRADY/POOL/AFP via Getty

Britain’s Princess Charlotte of Wales (L) reacts, watched by her brother Britain’s Prince George of Wales (C), as her father Britain’s Prince William, Prince of Wales (R) plays with a Union flag during the Coronation Concert at Windsor Castle in Windsor, west of London on May 7, 2023. - For the first time ever, the East Terrace of Windsor Castle will host a spectacular live concert that will also be seen in over 100 countries around the world. The event will be attended by 20,000 members of the public from across the UK.

On the subject of his father’s coronation, the prince continued, “For all that celebrations are magnificent, at the heart of the pageantry is a simple message: Service … My father’s first words on entering Westminster Abbey yesterday were a pledge of service. It was a pledge to continue to serve. Because for over 50 years, in every corner of the U.K, across the Commonwealth and around the world, he has dedicated himself to serve others, both current and future generations, and those whose memory must not be neglected.”

The Prince of Wales pointed to his father’s longstanding passion for environmental conservation (something he even incorporated into the ceremony itself): “Take the natural world. He warned us of the risks to our planet’s health long before it was an everyday issue. "

“Or the Prince’s Trust. It has supported over a million young people, many from disadvantaged backgrounds, to realize their ambitions,” he continued, referencing Charles' namesake charity, established 1976.

Can’t get enough ofPEOPLE’s Royals coverage?Sign up for our free Royals newsletterto get the latest updates onKate Middleton,Meghan Markleand more!

STEFAN ROUSSEAU/POOL/AFP via Getty

Britain’s Prince William, Prince of Wales speaks on stage inside Windsor Castle grounds at the Coronation Concert, in Windsor, west of London on May 7, 2023. - For the first time ever, the East Terrace of Windsor Castle will host a spectacular live concert that will also be seen in over 100 countries around the world. The event will be attended by 20,000 members of the public from across the UK. (Photo by Stefan Rousseau / POOL / AFP) (Photo by STEFAN ROUSSEAU/POOL/AFP via Getty Images)

“And, perhaps most importantly of all, my father has always understood that people of all faiths, all backgrounds, and all communities, deserve to be celebrated and supported,” the Prince of Wales added, emphasizing his father’s interest in and dedication to interfaith relations. “Pa, we are all so proud of you.”

“I also want to express my pride and gratitude for the millions of people who serve, in the forces, in classrooms, hospital wards and local communities,” William continued. “I wish I could mention you all. Your service inspires us, and tonight we celebrate you too.”

“I commit myself to serve you all: King, Country and Commonwealth,” he concluded. “God Save the King.”

source: people.com