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Prior to the issuing of Letters Patent in December 2012, only the eldest son of the then Prince William would be styled Prince. If the first child had been a daughter, she would not have had the right to the style of Princess or HRH. 

Crown Office

House of Lords, London SW1A 0PW

31 December 2012

The Queen has been pleased by Letters Patent under the Great Seal of the Realm dated 31 December 2012 to declare that all the children of the eldest son of The Prince of Wales should have and enjoy the style, title and attribute of Royal Highness with the titular dignity of Prince or Princess prefixed to their Christian names or with such other titles of honour.

C I P Denyer

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