Royal Family brings more than just changing your surname. At the moment, Kate Middleton and Prince William are the Duke and Duchess of Cambridge, but as he gets closer to the throne, their titles will change.
When Prince Charles is crowned King, Prince William will take over as the Prince of Wales.Kate could become the Princess of Wales - a title that Camilla declined out of respect for the late Princess Diana.
William will also take over the Duchy of Cornwall, while Prince Charles as the reigning monarch, will take the Duchy of Lancaster from the Queen.
This passing of power and title will be repeated when Prince George becomes (as the eldest son of the ruling monarch) the Prince of Wales when his dad is crowned King.
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