Kate Middleton and Prince William have been at odds with Meghan Markle and Prince Harry, ever since they decided to quit the royal family and move to the US.
The Duke and Duchess of Cambridge believe Meghan and Harry played the 'divide and conquer' tactic to get what they want.
As explained by Us Weekly's Royally Us podcast hosts Christina Garibaldi and Molly Mulshine, "The two brothers are working on similar things like mental health and conservation.
"It just really makes me understand more of why there is a rift. You can totally see that they just have different working styles," said Mulshine. One couple says, 'why can't we all do everything'."
She continued: "They believe a rising tide raises all ships. The other couple thinks they'll be more successful if they're more strategic and divide and conquer.
"So there's two different ways of looking at it. That's why they couldn't work together anymore," Mulshine added.