Royal 4Ever
If you are married you can only be referred to as your formal title. Kate Middleton should always be called “Her Royal Highness the Duchess of Cambridge.”

Diana-and-Fergie
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At Least 2
For over 60 years, royal families have no less than 2 children. A couple can have more, but no less. So far, the only couple who decided to have more is Queen Elizabeth II and the Duke of Edinburgh.

Royal-Children