Kin Groups and Descent. The basic kinship unit was the extended family, the aggregate of which formed the local band. Groups of bands made up tribes ( parcialidades ), which were sometimes known by particular names such as L'añagashik ("people from terra firma") or Takshik ("people from the southeast, from below, from the east"). Band exogamy and tribal endogamy prevailed. Bands observed rules of bilateral descent and were organized into matridemes.
Kinship Terminology. Toba kinship terminology is of the Hawaiian type for Ego's generation and lineal for the first ascending and first descending generations. There is a special terminology for mourning.