The system has both classificatory and descriptive terms. In addition to gender and generation, Iroquois kinship also distinguishes 'same-sex' and 'cross-sex' parental siblings: the brothers of Ego's (the subject from whose perspective the kinship is based) father, and the sisters of Ego's mother, are referred to by the same parental kinship terms used for Ego's Father and Mother. The sisters of Ego's father, and the brothers of Ego's mother, on the other hand, are referred to by non-parental kinship terms, commonly translated into English as "Aunt" and "Uncle".
The children of one's parents' same-sex siblings, i.e. parallel cousins, are referred to by sibling kinship terms. The children of Aunts or Uncles, i.e. cross cousins, are not considered siblings, and are referred to by kinship terms commonly translated into English as "cousin". In some systems, the kinship terms applied to cross-cousins are the same as those applied to brothers-in-law and sisters-in-law, due to preferential marriage practices (see below).
Marriage
Ego (the subject from whose perspective the kinship is based) is encouraged to marry his cross-cousins but discouraged or prohibited from marrying his parallel cousins. In many societies with Iroquois kinship terminologies, the preferred marriage partners include not only first cousins (mother's brother's children and father's sister's children), but more remote relatives who are also classified as cross-cousins by the logic of the kinship system. Preferential cross-cousin marriage can be useful in reaffirming alliances between unilineal lineages or clans.
Usage
The term Iroquois comes from the six Iroquois tribes of northeastern North America. Another aspect of their kinship was that the six tribes all had matrilineal systems, in which children were born into the mother's clan and gained status through it. Women controlled some property, and hereditary leadership passed through the maternal line. A woman's eldest brother was more important as a mentor to her children than their father, who was always of a different clan.
"Iroquois tradition had the lineage of the clan or tribe traced through the mother's side. However, the amount of power women held in the tribe decreased with time due to the American revolution."[2] (Lappas, Thomas).
Some groups in other countries also happen to be independently organized for kinship by the Iroquois system. It is commonly found in unilineal descent groups. These include:
Some communities in South India use the kinship tradition described above.[3]
Melanesia
Many of the cultures of Vanuatu use this type of kinship system. In Bislama (Vanuatu pidgin), paternal uncles and maternal aunts are referred to as smol papa "small father" and smol mama "small mother" respectively.
^The Origin of the Family, Private Property and the State.
Lappas, Thomas. ""for God and Home and Native Land": The Haudenosaunee and the Women's Christian Temperance Union, 1884–1921." Journal of Women's History 29.2 (2017): 62-85. ProQuest. Web. 28 Feb. 2022.
Starna, William A. "Lewis H. Morgan on Iroquois Material Culture." The American Indian Quarterly, vol. 20, no. 1, winter 1996, pp. 137+. Gale Academic OneFile, link.gale.com/apps/doc/A18832341/AONE?u=tel_a_pstcc&sid=bookmark-AONE&xid=18e8d6c0. Accessed 1 Mar. 2022.
William Haviland, Cultural Anthropology, Wadsworth Publishing, 2002. ISBN0-534-27479-X