Monogamy is not an officially proclaimed value, but the couples are generally monogamous (except for four holidays each year, at the solstices and equinoxes, when sexual promiscuity is widespread.) Single members of the families often take up with lovers from outside, and sometimes this results in the addition or subtraction of a family member. There seems to be a continual slow shifting of membership, probably something like what must have happened with our “extended families” a few generations back.
