The Wales children: Prince George, Princess Charlotte and Prince Louis' life in pictures
Today, the Wales children are three of the most beloved young members of the British royal family, but in the future they will be the guiding force behind one of the world's oldest surviving monarchies.
Prince George, 10, is the boy who was born to be King and has only inched closer to that role in the last few years, following the death of Queen Elizabeth II and coronation of King Charles III.
Princess Charlotte, nine, made history as the first princess who wouldn't be bumped down the royal line of succession by her younger brother and may one day serve a key role at her elder brother's side, like Princess Anne does for the King.
And Prince Louis, six, is the cheeky "rascal" who brings a touch of levity and mischief to an institution that still sticks to so many rules and traditions from centuries gone by.
But right now, they're just kids.
Keep reading to learn how they've grown up in the royal family, learned to adapt to their public roles, and what will come next for the Wales kids.
It was mid-afternoon on a typical Monday in London when a new heir to the British throne came into the world in the Lindo Wing of St Mary's Hospital.
From the moment he took his first breath on July 22, 2013, Prince George Alexander Louis was a symbol of the next generation of the monarchy, continuing hundreds of years of royal legacy.
The first child of Prince William and Catherine, then the Duchess of Cambridge, he was born to become a King one day, though he wouldn't know it until several years later, when he grew old enough to understand his place in the 'Firm'.
But George's arrival wasn't just significant for the monarchy, it was a milestone for his parents as well, who had to learn how to deal with a newborn for the very first time.
"He's a little bit of a rascal, I'll put it that way," Prince William told CNN a few weeks after George's arrival.
"He either reminds me of my brother or me when I was younger, I'm not sure, but he's doing very well at the moment."
He and Catherine were thrilled with the newest addition to their little family and took time off from royal duties to adapt to new parenthood.
The prince was christened when he was three months old at Chapel Royal in St James's Palace in London.
Like countless royal bubs before him, George wore a christening gown that has been passed down through the royal family for centuries.
The original gown was commissioned by Queen Victoria for her first-born child, daughter Victoria Adelaide Mary Louisa, in 1814 and was worn by 62 royal babies - including Prince William and Prince Harry - in the 163 years it was in use.
Eventually, it had to be swapped out for a replica, which is what George wore on the day of his christening in 2013.
The little royal wasn't even one year old when he embarked on his first royal tour with his parents in early 2014, when he travelled to Australia and New Zealand.
Like Princess Diana before her, Catherine didn't want to leave her young child home with nannies while she travelled on behalf of the crown, so she insisted on bringing little George along.
He was a hit with the general public and world leaders alike, delighting everyone he met with his adorable looks and antics.
Naturally, William and Catherine made sure to take George along on a few child-friendly outings on the tour, including a visit to Taronga Zoo in Sydney.
"I suspect George's first word might be 'bilby' – only because koala is harder to say. We really look forward to our time here together as a family," Wills had joked in a speech at the start of the tour.
It looks like he was right, given how intently his son watched this cute Bilby during his zoo trip.
Prince George also took part in a playgroup event at Government House in Wellington, New Zealand where he mingled with babies who had no idea they were sharing toys with a future king.
Though George was too young to understand the significance of what was going on, the trip cemented him as a royal fan favourite and ensured that people around the globe knew and loved the little boy who would grow up to be King of Britain.
His status as a beloved future monarch was set in stone before he even celebrated his first birthday.
Princess Charlotte arrived on May 2, 2015 and was the first royal daughter in history to benefit from changes to British royal succession laws that replaced male-preference primogeniture with absolute primogeniture.
It meant that unlike every royal woman before her, Charlotte would never be bumped down the line of succession by a younger male relative.
She was fourth in line to the throne upon her arrival and was named Charlotte Elizabeth Diana in honour of her great-grandmother, the Queen, and her late grandmother Princess Diana, whom Charlotte never had the chance to meet.
William and Catherine were delighted to have a daughter and George seemed more than happy to step into the role of big brother if this picture is anything to go by.
"She has been a little joy of heaven," William told the BBC after Charlotte's birth.
Catherine added in the ITV documentary Our Queen at Ninety, "It's very special having a new little girl. I feel very, very lucky that George has got a little sister.
"The Queen was really thrilled that it was a little girl, and I think as soon as we came back here to Kensington, she was one of our first visitors here."
Just a few weeks after his sister arrived and stole the limelight, George was back in the headlines as he made his debut on the balcony of Buckingham Palace for Trooping the Colour in 2015.
George looked darling in his blue ensemble and matching shoes, which were actually hand-me-downs from his dad; William originally wore the outfit for his own Trooping the Colour debut in 1984, almost 30 years before his son made his first appearance.
It was also one of the first times all three heirs to the throne - Charles, William and George - had been pictured together in public.
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