I ran across this in doing some #NaNoWriMo research (since I have to deal with Catholic clergy in 1952), and found it interesting both the information and for the, um, tone of the article (including advice on how to cajole a priest to keep him from encouraging your kids to call him by his first name, even with "Father" in front of it, because that's inappropriately informal).
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How to address Priests, Sisters, Clergy, Titles and Abbreviations
Marian T. Horvat gives guidelines of courtesy and etiquette, manners, on how to properly address clergy – bishops, priests, nuns.
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This was actually enlightening… when viewed from a historical perspective rather than a current one.