Whose parents are listed on the invitation?

Q: What is proper etiquette regarding whose parents are listed on wedding invitations?

A: Parents of the bride traditionally host weddings (host=pay for) however these days anything goes. The rule of thumb is to list whoever is hosting the wedding at the top of the invitation. If both sets of parents are pitching in and splitting expenses, they both get top billing. If the bride’s parents are paying but they want to mention the groom’s parents out of courtesy, his parents would then be listed underneath his name. If the bride and groom are paying for their own wedding, parents shouldn’t be listed at all and the bride and groom’s names go at the top, requesting the presence of their guests.