The short walk to our room had been interesting and instructive. This hotel seemed to cater to sabbatarians. All the rooms that we’d gotten a look at were laid out the same as ours, and most seemed to be occupied by foursomes. I wondered aloud if four was a magic Quinlan family number of some kind, and received a no from Bridget and a lecture. "The Quinlans have a complicated system that I’d characterize as a networked endogamy. People belong to a marriage group with potentially multiple male and female partners, but they could belong to more than one group. There are rules about your status and financial obligations within the group based upon whether you lived with that group or with another one."