 These form a relational web not just for description but for analysis of social dynamics.The picture that emerges is one of a complexly scalable social system that expands through reproduction, kinship alliances, and fissions, and overcomes internal conflicts and those with neighbors along routes of migration.These networks constitute a generative demographic engine for health, a potential for large sibling groups, and for extensive cooperation within and between these groups constructed through reciprocal ties of marriage.