Unmarried couples living together receive one invitation with both of their names. The word “and” implies marriage. So, they’re listed on separate lines with the woman listed first.
Ms. Rebecca Wright
Mr. Jacob Martin
If you don’t know who your guest is bringing as their plus one, use…
Ms. Rebecca Wright and guest
Make a note that “guest” is lowercase because it’s not a proper noun.
Traditionally, a man’s first and last name are never separated. Always list couples in the order of highest “ranking” if either of them are doctors, judges, military, etc.
Traditional form for a married couple…
Mr. and Mrs. Phillip Jackson
Modern form for a married couple where the woman’s first name is included…
Mrs. Elizabeth Jackson and Mr. Phillip Jackson
This one stumps a lot of couples. Most often, I see “Mr. and Mrs. Phillip and Elizabeth Jackson” or “Mr. Phillip and Mrs. Elizabeth Jackson” incorrectly written on invitations.
When the husband is the second of his name…
Mr. and Mrs. Phillip Jackson, junior
There is a comma and “junior” is written in lowercase letters. Don’t abbreviate to “Jr.”
If the husband is a doctor…
Dr. and Mrs. Phillip Jackson
If they have a PhD, use the abbreviated “Dr.” If they are a medical doctor, spell out the word “Doctor”. The same goes for the two examples below.
If the wife is a doctor…
Dr. Elizabeth Jackson and Mr. Phillip Jackson
The spouse with the higher ranking title is always listed first on an envelope.
If both are doctors…
The Doctors Jackson