"This is Prince Harry and Prince William going their separate way with their wives – they’re almost setting up two separate courts," said Rieden.
The royal expert claimed that Autumn would be a busy time for the royal family, with the Sussexes and Cambridges making plans for their respective tours.
"I think in those tours you really do see the essence of how different these two brothers’ jobs are...William and Kate are going without their children for the Foreign Office in what is being considered a post Brexit love-in," Rieden explained.
Prince William and Kate Middleton will be travelling to Pakistan, while Meghan Markle and Prince Harry are taking Archie Harrison on tour of South Africa.
The Duke and Duchess of Sussex recently posted an announcement about their South Africa trip on Instagram, stating:
"The duke and duchess are really looking forward to meeting so many of you on the ground and continuing to raise awareness of the high impact work local communities are doing across the commonwealth and beyond. This will be their first official tour as a family!"
The announcement also mentioned that Prince Harry will make solo visits to Angola, Malawi and Botswana.
Baby Archie will be the youngest royal to have visited South Africa (he will be five months old when he joins his parents on the trip).