A business letter to his/her place of employment should be addressed to Superintendent , to their home , as Mr. , Mrs. , or Ms. , if a social invitation.
When you know the name of the superintendent, you address him (or her) as "Mr. (Ms.) J. M. Franklin, Superintendent". If you do not know the name of the superintendent, simply use the title "Superintendent".
MR.
It should read: Rev.(Ret.) Mary & Mr. Smith
The envelope should read: Mr. John Doe & Dr. Jane Doe. If you don't know her first name then put: Mr. & Dr. John Doe.
Mr. & Mrs. <lastname>
* For High School Graduation invitations for couples it should be Mr. & Mrs., but, if the two people are living together you could address the envelope to: Mr. Jack Smith and Ms. Jane Doe. Even if they are younger friends or young relatives in your family there should always be a Mr. or Ms. in front of the name.
A correct way to address an envelope to Spain is: Senor (Mr.) Senora (Mrs.) or Senorita (Miss.)
m.et mme smith
On the outer envelope it should read: PERSONAL Mr. & Mrs. John Doe c/o Zero Acme Co., 0000 Hawthorne St. San Francisco, CA ZIP CODE #
Addressing an envelop to a woman with a boyfriend and young son: Just address the envelope to: Ms. Jane Doe & Mr. John Doe (if the young son is in their teens, but not necessary if they are a minor) & Mr. John Smith. So the envelope may read: Ms. Jane Doe & Mr. John Smith.
If you are not sure they are separated or divorced then address your envelope to both of the. If you know for sure they are separated then send a separate envelope to each one.
"Dear Mr. and Mrs. Smith". "The Reverend" is never used in direct address. If addressing an envelope (and therefore third person) it should be "Mr John and The Reverend Jane Smith".