In the years before the infamous royal rift between the Prince of Wales and the Duke of Sussex, the pair - along with the Princess of Wales - were a popular trio who frequently carried out official engagements together.
While the last four years have brought about a breakdown in this once strong relationship, it was still said that Kate was playing the role of the peacemaker between the warring siblings.
However, since further criticism from California, the Princess' diagnosis of cancer and her making it undeniably clear that Prince George, Princess Charlotte and Prince Louis are her absolute priority, it is unsurprising to see that this role is something of the past.
Former BBC royal correspondent Jennie Bond exclusively told OK!: "Catherine has far, far too much on her plate to bother about trying to rope in an estranged brother.
Read more on ok.co.uk