King Charles shares a deeply special bond with the Princess of Wales and has frequently been heard referring to her as his "darling daughter in law".
Away from their own close-knit relationship, Kate plays another role in ensuring that the King enjoys a special bond with his grandchildren, Prince George, Princess Charlotte and Prince Louis.
Appearing a recent Channel 5 documentary titled Kate: A Queen for the Future, a top expert examined the ways that Kate is succeeding in carrying out this "important" job.
Referring to this, leading royal author Robert Jobson explained: “Catherine is very important in the relationship between Charlotte, George, Louis and the King."
Robert continued: "When William and The King are not necessarily on the best of terms, as sometimes fathers and sons are, it's always Catherine who will make sure that the King, if he wants to see his grandchildren, sees his grandchildren. And that's important.”
This is in stark contrast to the relationship King Charles has with his other two grandchildren, Prince Archie and Princess Lilibet.
Following reports that the King was making plans to travel to the US to see his youngest son and his family, Meghan's father, Thomas Markle, has given an interview sharing his concerns for Archie and Lili's futures.
During a chat with New Zealand Woman's Weekly, Thomas said: "It struck me as very sad that Meghan and Harry's kids are being denied the right to know their cousins, who look like fantastic children, or take part in things like Trooping the Colour, which is their birth right.
"They are getting to the age where they will start to ask questions, as all kids do. I find myself wondering how Archie and Lilibet will feel in a few years' time when they realise all the things they have missed out on."
This is a sentiment which former BBC royal correspondent Jennie Bond has also aired caution on.
Speaking to OK!, the expert previously pointed out: "Children grow up and are innately curious about their heritage and background… and when your heritage is one of the most famous families in the world, it will undoubtedly seem rather odd and perhaps sad that you hardly know or remember them."
"Imagine Archie, aged 15, telling his friends, 'My grandpa is/was King! And my Uncle is/will be King too.' But he hardly knew or met them. How sad… and Meghan would have to bear the brunt of the responsibility for that."
