“The two brothers have very different roles," Rieden revealed.
"Prince William is going to be king one day. The Queen is 93 and she’s offloading a lot of her work both to her son and to her grandson.
"William has really had to up the ante and take on a lot of this heavy lifting."
Further comments on how the British monarch is handling the precarious situation between her grandsons have been made by the editor-in-chief of Majesty Magazine, Ingrid Seward.
"Her Majesty does not care for the alleged feuding amongst her grandchildren William and Harry.
"That would make her very sad. But she would never interfere with their lives."
The revelation comes after rumours of a feud between Prince Harry, Meghan Markle, Kate Middleton and Prince William, remain persistent.
Speculation of a royal rift reached fever pitch last month when the Duke and Duchess of Sussex parted ways with William and Kate on their shared charity, the Royal Foundation.
While it is unclear where the source of the tension lies, it seems the slow parting of William and Harry isn't helping relations heal.
WATCH: Prince Harry caught telling Meghan off!