"John Brown and Sally Smith would like you to help them celebrate their marriage" then don't forget the basic information about the wedding:
Mr. & Mrs. James Smith request the pleasure of your company at the marriage of their daughter, Sally to John Brown at Holy Trinity Church, Burton on Saturday 21st October, 2012 at 11ᚨam and afterwards at the Queen Victoria Hotel, Christchurch RSVP The Cottage, River Road, Burton Now we'll look at the wedding invitation etiquette if either set of parents are divorced or re_married. What do you do about step_parents? Do they expect a mention? Are you going to offend someone if you get this wrong? Here are some suggestions but in the end you'll need to avoid hurting anyone's feelings so just do what you think is right.