Archie's surname caused huge rift between Queen and Philip so other royals had to step in

Being a senior member of the royal family means you get all sorts of fancy titles, including HRH, dukedoms and honorary ranks.

But the Queen's relatives who are further down the line of succession don't have this privilege, which means they have to use a normal surname like the rest of us.

So while Prince George, Princess Charlotte and Prince Louis use their parents' 'Cambridge' title as their surname at school, their cousins Archie and Lilibet use the royal family's 'official' last name - Mountbatten-Windsor.