Marriage. Marriage within the band was traditionally prohibited. The scope of exogamy extended to friendly ethnic groups, especially the Nivaclé and the Tapíete. After resettlement, the tendency to ethnic exogamy expanded to include other indigenous groups as well as Creoles, especially in multiethnic villages. Divorce continues to be accepted, and can be initiated by either spouse.
Domestic Unit. The domestic unit together with age-grades were the essential articulations of the social system. Heads of families were traditionally able to impose their decisions on the leader of the band. The matrilocal extended family, normally including three generations, continues to predominate; there are also patrilocal units and nuclear families. The emergence of the nuclear family is a consequence of migrant work and wage earning since the beginning of the twentieth century.
Socialization. Children were and are raised permissively and their personal autonomy is furthered. As repositories of knowledge and guides to behavior, grandparents were formerly the main socializing agents. Such preeminence must be linked to the system of hierarchical age-grades, according to the principle that age confers status and prestige. The confrontation of formal education with the informal education imparted by elders has resulted in a progressive displacement of enculturative responsibilities to the parental generation, given the fact that the latter interact more smoothly within the regional/national context.