Even then, not every child or grandchild of the Queen receives a royal title.
Prince Edward, the Queen’s youngest son, simply goes by the title Prince Edward, Earl of Wessex, while his wife, Sophie, is the Countess of Wessex.
The heir apparent, a position currently occupied by Prince Charles, has a a host of its own titles and special privileges.
The Prince of Wales is an official royal title held exclusively for the earl apparent, while the Duke of Cornwall is also reserved for the Queen’s oldest son.
