Prince William will one day be King, and his wife Kate, the Duchess of Cambridge will be Queen consort. William is currently second in line to the throne behind his father Prince Charles. Kate and William’s son Prince George is currently third in line to the throne.
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But despite their royal titles, the members of the Royal Family are still expected to follow stringent rules.
The rules are in place to ensure tradition is followed and to ensure the future monarchy is protected.
However, sometimes, Kate and William have been known to break the rules.
Kate and William are known for being avid travellers.
The couple has jetted off around the world on royal tours which have sometimes included their children, Prince George, Princess Charlotte and Prince Louis.
One rule that the couple has sometimes broken involves air travel.
A rule which is thought to have dated back to the early days of air travel stated that two heirs to the throne cannot fly on a plane together.
Traditionally, monarchs and their heirs were not allowed to fly together in case of an accident.
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This would mean that Prince William and his children, who are all in line to the throne, would not technically be allowed to fly together.
However, the Duke and Duchess of Cambridge have been on a number of international journeys with their children.
One specific trip was when Prince William and Prince George travelled together on a tour to New Zealand and Australia.
But for this, the couple asked Her Majesty The Queen for permission.
At the time, the Royal press office told BBC’s Newsround: “They had to ask the Queen for permission but she said yes.”
The Royal spokesperson added: “While there is no official rule on this, and royal heirs have travelled together in the past, it is something that the Queen has the final say on.”
The tour at the time included visits to Australia’s Northern Territory and Christchurch in New Zealand.
Prince George was just eight-months-old at the time.
It was his first official overseas tour.
Prince William first visited Australia when he was just nine months old with his father the Prince of Wales and Diana, the Princess of Wales.
He also accompanied them to Auckland in New Zealand.
William last visited New Zealand in 2019 after the Christchurch mosque shootings.
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