The Honorable (similar to a judge)
addressing attorney and wife
Mr and Mrs would be proper. Attorneys are typical written to as Mister.
Depends on whether you wish to be kind, or offensive, right?
What is the proper salutation for a register of wills, e.g. Honorable John White?
The proper salutation for a probate judge is "The Honorable [Judge's Full Name]."
The proper salutation when writing to a judge is "Dear Judge [Last Name]" or "Your Honor."
The appropriate salutation depends on whether you also are a solicitor in your own country. If you are a female attorney too, then the appropriate salutation is "Chère Consoeur". However most French lawyers use the "Cher Confrère" salutation regardless of the gender of their interlocutor. If you are a man, you can write "Cher Confrère". If you are not an attorney, then the appropriate salutation always is 'Cher Maitre' or simply "Maître".
the correct salutation for two men is Messrs
Hello.
Your Honor
Dean actually is the proper salutation. One could say: Dean Redmond, would you please sign this form? Alternatively you could just use the Dr. salutation or the Professor salutation if those are appropriate, which they generally are.
You want to address them as "Honorable [full name]"