I've been searching the board for the answers to my questions but I wasn't able to find them, so I apologize if this has been covered.
I'm working preparing the start addressing our wedding invites.
1) Is this formal enough for addressing married couples - "Mr. & Mrs. Mark LastName"
2) What is the proper etiquette for addressing family / friends that are over 18 and are dating someone. Is "Mr. LastName & guest" acceptable? Or should I write "Mr. LastName & Ms. LastName"? Is the reverse of this (for example inviting my sister and her bf) should I address the envelope as "Ms. LastName & Mr. LastName"?
3) We are inviting some family members / friends that we believe are single. But we want them to bring a guest if they would like. In this case is the "Ms. LastName & guest" acceptable?
Thank you!