Well, they do believe in weddings in a sick sort of way. At least they had it had home
Mock weddings for the purpose of "scene", don't really mean that they believe in weddings. In fact, their mockery of marriage, their treatment of the children, and their encouragement of sexual activity between the children leads me to believe that these people were sick bastards who lost themselves to their fantasies and then dragged the children into their dungeon.
Dungeon being the operative word.