Daughters of a Baron
A daughter of a baron bears the courtesy style of 'The Honourable' (usually abbreviated to 'The Hon').
When she is unmarried this style is followed by her forename (eg The Hon Jane White). After marriage she drops the use of her forename and uses her surname only (eg The Hon Mrs Smith). The style of 'The Hon' is not used before 'Miss'.
The style of 'The Hon' is only used on the envelope in correspondence, in written descriptions (usually only on the first mention) and in formal documents. It is never used in conversation or on invitations or on visiting cards, when the correct style is 'Mrs', 'Miss' or 'Ms'.
How to Address the Daughters of a Baron
The recommended (social) style of address is as follows:
|Beginning of letter||Dear Mrs Brown|
|End of letter||Yours sincerely|
|Envelope||The Hon Mrs Brown|
|Joint form of address||Mr Benedict and the Hon Mrs Brown|
|Verbal communication||Mrs Brown|
|Invitation||Mrs Benedict Brown|
|Description in conversation||Mrs Brown|
|List of Directors or Patrons||Mary Brown (or Mrs Benedict Brown)|
|Place card||Mrs Benedict Brown|
|Legal document||Mary Jane Brown commonly called the Honourable Mrs Brown|
Should the daughter of a Baron marry the younger son of an Earl, or the son of a Viscount or Baron, she would also be addressed as The Hon Mrs Brown.
In this case, the joint form of address would be 'The Hon Benedict and Mrs Brown'