Prince George and Princess Charlotte's new surname they will be using following the death of the Queen was revealed publicly for the first time during the Queen's funeral order of service.
Upon becoming King, Charles named William and Kate as the Prince and Princess of Wales, and so going forward their children's surname will be Wales rather than Cambridge, reported WalesOnline.
It was not an automatic appointment but Charles decided to name William as the Prince of Wales and so, similar to how he and Harry were known while they were growing up, the children's surname will be Wales.
And royal expert Angela Mollard has told how the children will now have to get used to using their new names.
She reportedly said: "This must have been an enormous few days for Catherine.
"She's taken on a new role herself, but she's also got to teach her very young children. aged nine, seven and four, that their surnames have changed. They are no longer George, Charlotte and Louis Cambridge, they are now George, Charlotte and Louis Wales.
"Any parent will recognise that when you've taught a young child how to spell their name, that's the name they're knowing to among their classmates."
Princes s Charlotte was seen reminding her brother Prince George of royal protocol during the Queen's funeral procession.
The Prince and Princess of Wales' eldest children, aged nine and seven, went to the funeral service for their beloved 'Gan Gan' while youngest son Prince Louis, four, stayed at home.
It's understood the royal couple thought long and hard while having discussions with the children before deciding they would attend - and the young royals walked beside their parents as they followed the Queen's coffin into Westminster Abbey.
Afterwards, the Queen's coffin was transferred to the State Hearse at Wellington Arch ahead of beginning its journey to Windsor for a committal ceremony later this afternoon - and Charlotte could be seen whispering to her big brother.
She appeared to tell George "you need to bow" when the Queen's coffin came past them.
Charlotte then brought back memories of her great-grandmother as she pointed with her finger, just like the Queen used to do.
George did follow his sister's advice as he was seen bowing his head as a sign of respect to Her Majesty when her coffin began to drive off.
