I am not sure how to go about wording the addresses for this situation. I have several sets of friends who are in nontraditional marriage situations. There is one husband but 2 wives. They all have the same last name. Is it Mr & Mrs & Mrs John Doe for the outer envelope? I'm a little at a loss. I don't want to be rude to them about their alternative choice, who am I to judge. So I need a little help here.