Drs. Joseph and Anna Smith
number and street
city, state, zip
Dear Drs. Smith:
If you are addressing a married couple who are both doctors you can address them two ways. You can address them by either stating Drs. Jack and Jill Smith or Dr. Jack Smith and Dr. Jill Smith.
No, the title "Dr." is used regardless of marital status. It is a professional title that indicates the individual holds a doctoral degree in their field of study, and is not dependent on whether the person is married or not.
That is the correct spelling of "honeymooners" (just married couple).
The correct spelling is newlyweds (a recently married couple).
Marriage the correct answer
The correct way to address an envelope to a married couple that have different last names is to use both of their names. For example, you could write Mr. Johnson and Miss or Ms. Dwyer.
You can address a letter to two doctors as: Drs. John & Jane Doe.
There are a couple of questions :)
The couple was
Dear Mr. (name) and Mrs (name)
A couple dozen lighthousesa is not the correct English because both the couple and dozen are collective words.
"The couple don't know" is correct.