Royal commentator Katie Nicholl believes Kate and Prince William have made the "deliberate" choice to put the spotlight on their children more over the past few months than the public have been used to. This move, the royal author suggested, comes after their children - and Prince George and Princess Charlotte in particular - have been introduced to what their future lives could look like as full-time working members of the Royal Family.

She told OK! magazine: "In the last year or so we've seen Charlotte and her siblings emerge more onto the public stage - a deliberate move by William and Kate, who initially protected them from the spotlight but are becoming more relaxed now.

"Even back in 2016, when they took George and Charlotte on the official royal tour of Canada, they were giving them both an early introduction to what their parents do, and what their lives may one day look like."

Prince George and Princess Charlotte have already gained some experience at royal work as they took part in royal visits, tours and engagements despite their young age.

The seven-year-old and future King, Prince George, took part in the Cambridges' tour to Australia and New Zealand when he was only nine months old.

In September 2016, George and Charlotte, who turned six on Sunday, made a rare joint appearance at an official engagement during the royal tour to Canada.

Then, the children - and future face of the monarchy in Canada - played in public at the Government House in Victoria, which was filled with balloons to George and Charlotte's delight.

The following year, Prince George and Princess Charlotte accompanied their parents abroad again, visiting Germany and Poland.

While in Germany, little Princess Charlotte was seen throwing a tantrum.

According to Ms Nicholl, the way Kate reacted gives a glimpse of how the little Cambridges are being brought up.

She said: "When Kate and William took the children on a trip to Poland and Germany in 2017, Charlotte had 'a moment' - as children do.

"But I was struck by the way that Kate crouched down to her level.

"She wasn't telling her off and yet Charlotte responded to her quiet words."

Princess Charlotte also showed she has been introduced to curtseys and royal etiquette on Christmas Day 2019, when she was seen paying homage to the Queen outside the church.

During their first Christmas Day walkabout, both Charlotte and George were introduced to interactions with royal fans - who have been waiting for them for hours.

Most likely due to the pandemic which dramatically changed the royal diary, Prince Louis has so far only attended the Trooping the Colour parade in 2019 and a special performance of Pantoland in December 2020.

However, he has also appeared on video alongside his brother and sister to ask Sir David Attenborough a question on nature.

The adorable video showed Kate and William's readiness at involving their children in their royal work, as Sir David and Prince William are tightly connected in their environment and conservation work.

More recently, Kate and Prince included their children in a touching family video released to mark their 10th wedding anniversary.

In it, the Duke and Duchess of Cambridge are seen playing with them on a beach close to their home in Norfolk and roasting marshmallows.

Prince George, Princess Charlotte and Prince Louis are set to play a key role in the Royal Family when their time comes.

As children of the future Prince and Princess of Wales, they will be expected to become full-time working royals once they completed their studies or work experiences.

And while George will need to learn how to one day be the head of state, his siblings will likely be his crucial supporting acts, carrying out royal engagements, tours and visits for a Royal Family which is set to increasingly reduce the number of its active members due to age and a rumoured plan by Prince Charles to slash its cost and make it more modern.