If you were to see a peer disrespecting an elderly patient or doing or saying something inappropriate, how would you respond?

This isn't your problem to fix. You can't go wrong answering this question by saying you would go up the chain of command. A hospital or group wants something like this handled a certain way, especially with the patient's whole family watching, and their best assurance that this will happen (when you're involved) is to pledge yourself to that chain of command, i.e., up the ranks to department chairman, Executive Committee, administrator, etc.