When addressing correspondence to a married couple, the husband’s first name should not be separated from his surname. For example:
Jane Smith and John Smith would be written:
Jane and John Smith (informal)
Mr. and Mrs. John Smith (formal)
The woman’s name precedes the man’s, leaving his first and last name intact. You can also write out both names separately. When doing so, the wife should always go first.
Jane Smith and John Smith (informal)
Mrs. Jane Smith and Mr. John Smith
Although, when you have a last name like mine, you’ll probably only want to write that once!
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