Michelle Obama and Prince Harry helped kick off the 2016 Invictus Games in Orlando, Florida, on Sunday

By Lindsay Kimble
Updated May 09, 2016 08:30 AM
Kensington Palace

Uncle Harry knows how to have fun – when it’s appropriate.

Just one week after Prince Harry opened up to PEOPLE about the inspiration behind his Invictus Games, the royal joined forces with First Lady Michelle Obama and revealed some behind-the-scenes moments from the first family’s recent meeting with the British royals – including a bathrobe-clad Prince George.

“I have to say that the most precious thing – if you haven’t already fallen in love – is to see him with his nephew,” Obama told Robin Roberts of Harry after kicking off the Invictus Games on Sunday night.

Obama noted that the little Prince didn’t understand why Harry was on his best behavior around President Barack Obama and the First Lady, explaining, “Throughout he was like, ‘Uncle Harry, Why are you so quiet?’ ”

Added Harry, “Usually I’m throwing him around the room and stuff.”

PEOPLE’s latest cover star also laughed with Obama about their mic-dropping video exchange ahead of the Games, explaining that the Queen was more than happy to participate in the face-off between the U.S. and the U.K.

“When I showed her the video and I told her, she said, ‘What do we need to do? Let’s do this,’ ” Harry said.

The Invictus Games are about so much more than a little friendly competition between counties, Obama and Harry said, however.

Both the First Lady and Harry – who served as an attack helicopter pilot in the Royal Army Air Corps – said the Games are helping de-stigmatize mental illness among military veterans.

“What we all know is that mental health can affect us all,” Obama explained. “It’s not just men and women in uniform. It’s not just our veterans. They come back and they’re ready to work and – but for those who do, it’s so important for us to work to de-stigmatize it so that people feel the support to go out and get the support they need.”

To read the full interview with Prince Harry, pick up the latest issue of PEOPLE.

Harry noted that the idea that all veterans are “like a ticking time bomb” is incorrect, noting that “invisible injuries” are “not a life sentence.”

“You can find coping mechanisms and you can get your life back on track,” he explained.

The Invictus Games, held in Orlando, Florida, include 10 different events, including wheelchair basketball, sitting volleyball, and indoor rowing. The Prince launched the competition in 2014, and it has since grown to over 500 servicemen and servicewomen from 14 countries.

Of the Games, Obama explained, “These men and women are looking for their next mission. Once they take that uniform off they’re still looking for ways to serve. And we can’t waste that talent… they’re some of the best citizens that you’ll find.”

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Added Harry, “[It] doesn’t have to be camouflage, but wearing a uniform, to be able to wear your national flag again on your left chest or on your left arm is such a massive thing for these guys.”

And being one of those guys has left an indelible mark on the 31-year-old.

“I signed up because I wanted to be one of the lads, but then this sort of normality for me to be amongst these guys was so important. It’s certainly given me a sort of purpose in life.”

Similarly, he told PEOPLE, “I come back and I say, ‘How can I use my name and that spotlight to the best effect?’ ” Creating the Games, he noted, was “almost like a cure for that pain I had back then.”