Princess Kate and Prince William feel "incredibly resentful" towards Prince Harry and Meghan Markle as they've had to "pick up the slack", a commentator has claimed.
The Duke and Duchess of Sussex quit the Royal Family in 2020 to move to Montecito, California.
The couple have had a strained relationship with William and Kate since.
An insider revealed it's partially down to the "extra workload that's been handed to" William and Kate since the Sussexes stepped down.
Harry and Meghan stepped down as working royals in 2020
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The source added: "Prince William and Kate are feeling incredibly resentful towards Meghan and Harry for leaving them to pick up the work they dropped when they moved to the States.
"The extra workload that's been handed to them is huge.
"It's given them even more responsibility, but also had a huge impact on their marriage and family life, and at times it can feel like they are cracking under this relentless pressure.
"With less time at home together and having to spend more time apart, they feel constantly torn apart in different directions and they insist that wouldn't be happening if Harry and Meghan hadn't abandoned their royal duties," the insider told Closer magazine.
Prince William and Princess Kate have been left to pick up the royal duties
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This comes after reports that the Prince and Princess of Wales are said to be eyeing up making it big in America.
This will mean that Meghan and Harry will have new competition over in the States.
The Waleses are said to be in the process of submitting a trademark application in the US.
PR expert Andy Barr shared how the Sussexes will be feeling about this news.
Prince Harry and Meghan Markle at the Invictus Games
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He said: "I love brand Meghan and Harry but I do think that were Kate and Wills wanting to crack America, as rumoured, they would do so with far greater ease and speed than their power couple rivals.
"Whilst Harry and Meghan have a powerful and well-established network of celebrity friends and 'fixers', there is no substitute for being an actual, fully paid up member of the Royal Family.
"The global interest and intrigue in the British Royal Family means that they are guaranteed crowds wherever they go and whatever they do," Barr told The Mirror.
