A nuclear family (also known as an elementary family, atomic family, or conjugal family) is a term for a
family
Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...
group consisting of
parent
A parent is either the progenitor of a child or, in humans, it can refer to a caregiver or legal guardian, generally called an adoptive parent or step-parent. Parents who are progenitors are First-degree relative, first-degree relatives and have ...
s and their
child
A child () is a human being between the stages of childbirth, birth and puberty, or between the Development of the human body, developmental period of infancy and puberty. The term may also refer to an unborn human being. In English-speaking ...
ren (one or more), typically living in one
home
A home, or domicile, is a space used as a permanent or semi-permanent residence for one or more human occupants, and sometimes various companion animals. Homes provide sheltered spaces, for instance rooms, where domestic activity can be p ...
residence. It is in contrast to a
single-parent family, a larger
extended family
An extended family is a family that extends beyond the nuclear family of parents and their children to include aunts, uncles, grandparents, cousins or other relatives, all living nearby or in the same household. Particular forms include the stem ...
, or a family with more than two parents. Nuclear families typically center on a
married
Marriage, also called matrimony or wedlock, is a culturally and often legally recognised union between people called spouses. It establishes rights and obligations between them, as well as between them and their children (if any), and b ...
couple that may have any number of children. There are differences in definition among observers. Some definitions allow only biological children who are full-blood siblings, some consider adopted or half- and step-siblings a part of the
immediate family, but others allow for a step-parent and any mix of dependent children, including stepchildren and adopted children.
Some sociologists and anthropologists consider the extended family structure to be the most common family structure in most cultures and at most times for humans, rather than the nuclear family.
The term ''nuclear family'' was popularized in the 20th century. Since that time, the number of North American nuclear families is gradually decreasing, while the number of alternative family formations has increased.
Etymology
The term ''nuclear family'' first appeared in the early 20th century. The American dictionary
Merriam-Webster
Merriam-Webster, Incorporated is an list of companies of the United States by state, American company that publishes reference work, reference books and is mostly known for Webster's Dictionary, its dictionaries. It is the oldest dictionary pub ...
dates the term back to 1924,
and the British ''
Oxford English Dictionary
The ''Oxford English Dictionary'' (''OED'') is the principal historical dictionary of the English language, published by Oxford University Press (OUP), a University of Oxford publishing house. The dictionary, which published its first editio ...
'' has a reference to the term from 1925; thus the term is relatively new. The phrase is taken from the general use of the noun ''nucleus'', originating in the
Latin
Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...
, meaning 'nut', i.e. the core of something.
In its most common use, the term ''nuclear family'' refers to a household consisting of a
mother
A mother is the female parent of a child. A woman may be considered a mother by virtue of having given birth, by raising a child who may or may not be her biological offspring, or by supplying her ovum for fertilisation in the case of ges ...
, a
father
A father is the male parent of a child. Besides the paternal bonds of a father to his children, the father may have a parental, legal, and social relationship with the child that carries with it certain rights and obligations. A biological fat ...
, and their
child
A child () is a human being between the stages of childbirth, birth and puberty, or between the Development of the human body, developmental period of infancy and puberty. The term may also refer to an unborn human being. In English-speaking ...
ren, all living in one household dwelling.
George Murdock, an observer of families, offered an early description:
Many individuals are part of two nuclear families in their lives: the family of origin from which they are offspring, and the family of procreation for which they are a parent.
Alternative definitions have evolved to include family units with
same-sex parents,
adoption
Adoption is a process whereby a person assumes the parenting of another, usually a child, from that person's biological or legal parent or parents. Legal adoptions permanently transfer all rights and responsibilities, along with filiation, fro ...
of members, and perhaps additional adult relatives who take on a cohabiting parental role.
History
DNA extracted from bones and teeth discovered at a 4,600-year-old
Stone Age
The Stone Age was a broad prehistory, prehistoric period during which Rock (geology), stone was widely used to make stone tools with an edge, a point, or a percussion surface. The period lasted for roughly 3.4 million years and ended b ...
burial site in Germany has provided the earliest scientific evidence for the social recognition of a family unit consisting of two parents with their multiple children.
Historians
Alan Macfarlane
Alan Donald James Macfarlane (born 20 December 1941) is a British anthropologist and historian, and a Professor Emeritus of King's College, Cambridge. He is the author or editor of 20 books and numerous articles on the anthropology and histo ...
and
Peter Laslett
Thomas Peter Ruffell Laslett (18 December 1915 – 8 November 2001) was an English historian.
Biography
Laslett was the son of a Baptist minister and was born in Bedford on 18 December 1915. Although he spent much of his childhood in Oxford, h ...
, among other European researchers, say that nuclear families have been a primary arrangement in England since the 13th century. This primary arrangement was different from the typical arrangements in Southern Europe, in parts of Asia, and the Middle East, where it was common for young adults to remain residing in or marrying into a family home. In England, multi-generational households were uncommon because young adults would save enough money to move out, into their own household once they married. Sociologist Brigitte Berger argued, "the young nuclear family had to be flexible and mobile as it searched for opportunity and property. Forced to rely on their own ingenuity, its members also needed to plan for the future and develop bourgeois habits of work and saving." Berger also mentions that this could be one of the reasons that the Industrial Revolution began in England and other Northwest European countries. However, the historicity of the nuclear family in England has been challenged by Cord Oestmann.
Influenced by church and theocratic governments, family unit structures of a married couple and their children were present in Western Europe and New England in the 17th century. With the emergence of
proto-industrialization
Proto-industrialization is the regional development, alongside commercial agriculture, of rural handicraft production for external markets.
Cottage industries in parts of Europe between the 16th and 19th centuries had long been a niche topic of ...
and early capitalism, the nuclear family became a financially viable social unit. Nonetheless, the results of
Steven Ruggles
Steven Ruggles (born May 8, 1955 - New Haven, Conn.) is Regents Professor of History and Population Studies at the University of Minnesota, and the director of the IPUMS Center for Data Integration. He is best known as the creator of IPUMS, the ...
' assessment of world census data suggest "nineteenth-century Northwest Europe and North America did not have exceptionally simple or nuclear family structure."
Conjugal family roles have changed over the course of history. Historically, marriages were exclusively opposite-sex and it was assumed that the male would be the head of the household and provide for the nuclear family while the woman would stay in the home and care for the children. However, conjugal roles have evolved over the years; in modern times, women often share breadwinning responsibilities with the men, and same-sex couples have become more common.
[
]
Since the time the term first coined, the number of North American nuclear families has gradually decreased, while the number of alternative family formations has increased.
Compared with extended family

An
extended family
An extended family is a family that extends beyond the nuclear family of parents and their children to include aunts, uncles, grandparents, cousins or other relatives, all living nearby or in the same household. Particular forms include the stem ...
group consists of non-nuclear (or "non-immediate") family members considered together with nuclear (or "immediate") family members. When extended family is involved they also influence children's development just as much as the parents would on their own.
In an extended family resources are usually shared among those involved, adding more of a community aspect to the family unit. This is not limited to the sharing of objects and money, but includes sharing time. For example, extended family members such as
grandparent
Grandparents, individually known as grandmother and grandfather, or Grandma and Grandpa, are the parents of a person's father or mother – paternal or maternal. Every sexually reproducing living organism who is not a genetic chimera has a maxi ...
s are able to watch over grandchildren, allowing parents to pursue careers, and allows the parents to have reduced stress levels.
Extended families also contribute to children's mental health due to increased resources in terms of adult support.
Changes to family formation

In 2005, information from the
United States Census Bureau
The United States Census Bureau, officially the Bureau of the Census, is a principal agency of the Federal statistical system, U.S. federal statistical system, responsible for producing data about the American people and American economy, econ ...
showed that 70% of children in the U.S. lived in two-parent families,
with 66% of those living with parents who were married, and 60% living with their biological parents. Furthermore, "the figures suggest that the tumultuous shifts in family structure since the late 1960s have leveled off since 1990".
The Pew Research Center's analysis of data from the American Community Survey and the decennial census revealed that the number of children living outside of the traditional ideal of parents marrying young and staying together till death has risen precipitously between the mid-to-late 20th century and the early 21st century. In 2013, only 43% of children lived with married parents who are in their first marriage, down from 73% in 1960. Meanwhile, the share of children living with a single parent was 34% in 2013, up from 9% in 1960.
When considered separately from couples without children,
single-parent families, and unmarried couples with children, the United States nuclear families appear to constitute a minority of households—with a rising prevalence of other family arrangements. In 2000, nuclear families with the original biological parents constituted roughly 24.10% of American households, compared with 40.30% in 1970.
Roughly two-thirds of all children in the United States will spend at least some time in a single-parent household. According to some sociologists, "
he nuclear familyno longer seems adequate to cover the wide diversity of household arrangements we see today." (Edwards 1991; Stacey 1996). For this reason, a new term ''postmodern family'' has been introduced to describe the great variability in family forms, including single-parent families and couples without children.
Nuclear family households are now less common compared to household with couples without children, single-parent families, and unmarried couples with children.
In the UK, the number of nuclear families fell from 39.0% of all households in 1968 to 28.0% in 1992. The decrease accompanied an equivalent increase in the number of single-parent households and in the number of adults living alone.
Professor Wolfgang Haak of
Adelaide University
Adelaide University is a planned public university, public research university based in Adelaide, South Australia. Established in 2024, it will combine the University of Adelaide, the third-oldest university in Australia, and the University of ...
, detects traces of the nuclear family in prehistoric Central Europe. A 2005 archeological dig in Elau in Germany, analyzed by Haak, revealed genetic evidence suggesting that the 13 individuals found in a grave were closely related. Haak said, "By establishing the genetic links between the two adults and two children buried together in one grave, we have established the presence of the classic nuclear family in a prehistoric context in Central Europe.... Their unity in death suggest
a unity in life."
This paper does not regard the nuclear family as "natural" or as the only model for human family life, expressed as, "This does not establish the elemental family to be a universal model or the most ancient institution of human communities. For example, polygamous unions are prevalent in ethnographic data and models of household communities have apparently been involving a high degree of complexity from their origins."
Lastly, large shifts in the financial landscape for families has made the historically middle class, traditional, nuclear family structure significantly more risky, expensive, and unstable. The expenses associated with raising a family; notably housing, medical care, and education, have all increased very rapidly, particularly since the 1950s. Since then middle class incomes have stagnated or even declined, whilst living costs have soared to the point where even two-income households are now unable to offer the same level of financial stability that once was possible under the single-income nuclear family household of the 1950s.
Influences upon family size
As a
fertility factor, single nuclear family households generally have a higher number of children than co-operative living arrangements, according to studies from both the
Western world
The Western world, also known as the West, primarily refers to various nations and state (polity), states in Western Europe, Northern America, and Australasia; with some debate as to whether those in Eastern Europe and Latin America also const ...
and
India
India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...
.
There are studies that show a difference in the number of children wanted per household according to where the family lives, finding that families living in rural areas wanted to have more children than families living in urban areas. A study conducted in Japan between October 2011 and February 2012 further researched the influence of area of residence on mean desired number of children. Researchers of the study in Japan came to the conclusion that the women living in rural areas with larger families were more likely to want more children, compared to women who lived in urban areas.
"Traditional" North American family

For
social conservatism
Social conservatism is a political philosophy and a variety of conservatism which places emphasis on Tradition#In political and religious discourse, traditional social structures over Cultural pluralism, social pluralism. Social conservatives ...
in the
United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
and
Canada
Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...
, the idea that the nuclear family is
tradition
A tradition is a system of beliefs or behaviors (folk custom) passed down within a group of people or society with symbolic meaning or special significance with origins in the past. A component of cultural expressions and folklore, common e ...
al is a very important aspect, where
family is the primary unit of society. These movements oppose
alternative family forms and social institutions that are seen by them to undermine
parental authority. The number of nuclear families is slowly dwindling in the U.S. as more women pursue higher education, develop professional lives, and delay having children until later in their life.
Children and
marriage
Marriage, also called matrimony or wedlock, is a culturally and often legally recognised union between people called spouses. It establishes rights and obligations between them, as well as between them and their children (if any), and b ...
have become
less appealing as many women continue to face societal, familial, and/or peer pressure to give up their education and career to focus on stabilizing the home.
As ethnic and cultural diversity continues to grow in the United States, it has become more difficult for the traditional nuclear family to remain a norm.
Data from 2014 also suggests that
single parents and the likelihood of children living with one parent is correlated with race. The Pew Research Center projected that 54% of African Americans will be single parents compared to only 19% of European Americans.
Several factors account for the differences in family structure including economic and social class. Differences in education level also change the percentage of single parents. In 2014, 46% of children raised by a parent(s) with less than a high school education were raised by a single parent compared to 12% raised by a parent(s) who graduated from college.
Critics of the term ''traditional family'' point out that in most cultures and at most times in history, the
extended family
An extended family is a family that extends beyond the nuclear family of parents and their children to include aunts, uncles, grandparents, cousins or other relatives, all living nearby or in the same household. Particular forms include the stem ...
model has been the most common, not the nuclear family. The nuclear family has had a longer tradition in England than in other parts of Europe and Asia. England contributed large numbers of immigrants to the Americas, likely influencing the form considered "traditional" there and during the 1960s and 1970s, the nuclear family was documented as the most common form in the U.S.
The concept that narrowly defines a nuclear family as central to stability in modern society that has been promoted by
familialists who are social conservatives in the United States has been challenged as historically and sociologically inadequate to describe the complexity of family relations dynamics. In "Freudian Theories of Identification and Their Derivatives"
Urie Bronfenbrenner
Urie Bronfenbrenner (April 29, 1917, Moscow – September 25, 2005) was a Russian-born American psychologist best known for using a contextual framework to better understand human development. This framework, broadly referred to as 'ecological sys ...
states, "Very little is known about the extent variation in the behavior of fathers and mothers towards sons and daughters, and even less about the possible effects on such differential treatment." Little is known about how parental behavior and identification processes work, and how children interpret sex role learning. In his theory, he uses "identification" with the father in the sense that the son will follow the sex role provided by his father and then for the father to be able to identify the difference of the "cross sex" parent for his daughter.
Law
Western societies often treat marriage as a legally-binding relationship, rather than an informal agreement. In these societies, both partners usually share control of their children's upbringing. They both have roles as a parent to protect their children, oversee the development of their children in society, and see to the survival of their children.
The term is also applied to partners who are in a
committed relationship, but not legally married.
See also
*
Astronaut family
*
Clan
A clan is a group of people united by actual or perceived kinship
and descent. Even if lineage details are unknown, a clan may claim descent from a founding member or apical ancestor who serves as a symbol of the clan's unity. Many societie ...
*
Eskimo kinship
Eskimo kinship (or Inuit kinship in Canada) is a category of kinship used to define family organization in anthropology. Identified by Lewis H. Morgan in his 1871 work ''Systems of Consanguinity and Affinity of the Human Family'', the Eskimo syst ...
*
Extended family
An extended family is a family that extends beyond the nuclear family of parents and their children to include aunts, uncles, grandparents, cousins or other relatives, all living nearby or in the same household. Particular forms include the stem ...
*
Family relationships
*
Family values
Family values, sometimes referred to as familial values, are traditional or cultural values that pertain to the family's structure, function, roles, beliefs, attitudes, and ideals. Additionally, the concept of family values may be understood ...
*
Hajnal line
The Western European marriage pattern is a family and Demography, demographic pattern that is marked by comparatively late marriage (in the middle twenties), especially for women, with a generally small age difference between the spouses, a sign ...
*
Human bonding
Human bonding is the process of development of a close relationship, close interpersonal relationship between two or more homo sapiens sapiens, people. It most commonly takes place between family members or friends, but can also develop among gr ...
*
Immediate family
*
Intentional community
An intentional community is a voluntary residential community designed to foster a high degree of group cohesiveness, social cohesion and teamwork. Such communities typically promote shared values or beliefs, or pursue a common vision, wh ...
*
Joint family
*
*
Origins of society
*
Sociology of the family
Sociology of the family is a subfield of sociology in which researchers and academics study family structure as a social institution and unit of socialization from various sociological perspectives. It can be seen as an example of patterned soci ...
*
Structural functionalism
Structural functionalism, or simply functionalism, is "a framework for building theory that sees society as a complex system whose parts work together to promote solidarity and stability".
This approach looks at society through a macro-level o ...
*
Alliance theory
Alliance theory, also known as the general theory of exchanges, is a Structuralism, structuralist method of studying kinship relations. It finds its origins in Claude Lévi-Strauss's ''Elementary Structures of Kinship'' (1949) and is in oppositi ...
*
Types of marriages
The type, functions, and characteristics of marriage vary from culture to culture, and can change over time. In general there are two types: civil marriage and Marriage#Religion, religious marriage, and typically marriages employ a combination o ...
Notes
References
Bibliography
*
*
*
* Durkheim, Emile. "The conjugal family". ''Emile Durkheim on institutional analysis'' (1978): 229-239.
*
External links
*
A Date With Your Family, a 1950s social guidance film about an idealized family dinner
*
Early Human Kinship was Matrilinealby Chris Knight (anthropological debates as to whether the nuclear family is natural and universal)
{{DEFAULTSORT:Nuclear Family
Family
Living arrangements
Social conservatism
Marriage, unions and partnerships