The household is the main unit of production and consumption—with the occasional addition of others from what appears to be an extended patrilineal family, often localized in the same ranchería, neighborhood, or village. Along with the offices and loyalties of the towns and anexos are the apellido group alliances, which crosscut village boundaries. These are associations (sometimes three or four in a village) of individuals sharing the same Spanish surname. Children of the same parents often have different surnames. Apellido groups may be the remaining shells of nonlocalized patrilineal clans of antiquity.