They all have different forms of address.
- The King is addressed to as "Your Majesty"
- The Queen is addressed to as "Your Majesty"
- Princes (including The Prince of Wales) are addressed to as "Your Royal Highness"
- Princesses are addressed to as "Your Royal Highness"
- A Duke and a Duchess are addressed to as "Your Grace"
- Marquess, Earl, Viscount, Baron are addressed to as "My Lord" or "Your Lordship"
- Marchioness, Countess, Viscountess, Baroness are addressed to as "My Lady" or "Your Ladyship"
- Baronet and a Knight is addressed to as "Sir"
- Baronetess in her own right is addressed to as "Dame"
- Baronetess (Baronet's wife) is addressed to as "Lady"
- Daughters of a Duke and Earl are addressed to as "Lady"
- Daughters of a Viscount, Baron and Lord of Parliament are addressed to as "Honourable"
- Sons of a Duke and Earl are addressed to as "Lord"
- Sons of a Viscount, Baron and Lord of Parliament are addressed to as "Honourable"
- If the Royals and/or nobles attend a very formal event, they will address each other with their appropriate titles and styles (Royal Highness, Your Grace, Lady, etc).
- If, however, it is a private or relaxed official event, members of nobility are likely to address each other by first name (if acquainted) or just as "Sir".
- Members of nobility are unlikely to address member of the Royal Family by first name unless they know each other well. However, they will never address the Queen in any other way but "Your Majesty".
- Members of the same Royal Family (if not on a formal event), address each other by first-name only.