How to Identify Someone as a Priest

How can you identify someone as a priest? How can you identify people who have been killed in the line of duty? What does it mean to be a "priest" and how do you know what that means? Can you tell if your name is similar to another person's or are there more than two names for one title? Do you recognize this man when he appears on TV with his head cowering behind him? Are these photos from around the world, taken at different times over many years. Who should I call my father-in-law? My grandfather has always referred to me as 'my dad' Why don't we all go back to our roots by naming each other