I am heading to become delivering school commencement invites quickly. One invite will a couple and that I am uncertain how to deal with the invite. She is a university teacher and it has her PhD. By He's also a instructor she wants to go, but doesn't have a PhD. If the invite be tackled to Mister. and Doctor. Then how should it be done?, if not done? I am the very first individual in my family to graduate from university, and haven't attended any university graduations so I am uncertain of the appropriate etiquette in this case.