Human Development · Foundations
family development The study of how families change across the life course, treating the family unit — its membership, roles, and connections — as what develops. Full entry → is the study of how families change across the life course — the working definition in the family-development tradition that grew from Evelyn Duvall's classic work. Its best-known map, the family life cycle The classic framing, associated with family researcher Evelyn Duvall, that pictures families moving through stages such as formation, child-rearing, launching, and later life. Full entry →, runs from formation, through child-rearing The years of raising children, when a family's routines, resources, and roles organize around children's needs. Full entry →, to launching The process in which children transition from dependence on their parents to independent adulthood. Full entry → children and later life. Parenting is the caregiving role at the heart of the child-rearing years, and many midlife adults belong to the sandwich generation Adults who have a parent age sixty-five or older and are also raising a child under eighteen or financially supporting an adult child. Full entry →, caring for children and aging parents at once. The honest part: the cycle is a lens, not a script. Families vary widely, and each is a living system, not a snapshot.
Families are the first setting of development and one of the last: children are raised inside them, and they keep changing long after the children are grown. Family development matters academically because it connects the individual lifespan story to the family story that carries it — the two cannot be separated. It matters practically because launching children, caring for aging parents, and living in multigenerational households touch most adults at some point, and the sandwich generation is a sizable share of the population. And it matters honestly: treating the life cycle as a lens rather than a script keeps us from measuring real families against a picture that was never universal.
Family development is the study of how families change across the life course. That is the working definition used in the family-development research tradition that grew out of the classic mid-century work of family researcher Evelyn Duvall, whose book Family Development treated the family itself — not just the individuals inside it — as something that develops over time. Where lifespan development tracks one person from conception to death, family development tracks a family unit: who belongs to it, how members are connected, what roles they play, and how those roles and relationships rearrange themselves as the years pass. The unit of study matters. When the Nguyen family grows from a couple into parents of a toddler and then parents of a teenager, individual development is happening in each person — but something else is also happening to the family as a whole: its structure, routines, and shared tasks are reorganizing. That second story is family development, and it runs as long as the family does.
The best-known map of family development is the family life cycle, the classic framing associated with Duvall: the idea that families move through a recognizable sequence of stages. Four broad stages are enough for an orientation. Formation is the stage when a new family unit takes shape — two people set up a household together, and often become parents; for most people this happens in early adulthood. Child-rearing is the long stretch when the family's routines, finances, and roles organize around raising children. Launching is the process in which children transition from dependence on their parents to independent adulthood — the stage the OpenStax Lifespan Development textbook describes as children moving from being dependent to being independent young adults, with parents often providing practical and financial support along the way. Later life is the stage when adult children and aging parents renegotiate their roles, when grandparenting begins, and when caregiving can flow in both directions. One line each is all this lesson owes the stages: they are the classic framing, and the honest note below explains why real families bend them.
Parenting is the caregiving role of raising children. Stated that simply, it is one of the central jobs of the child-rearing years, and it changes shape as children grow: the OpenStax textbook describes how parent-child relationships keep adjusting as children become more independent, and how parenting in middle adulthood often means supporting children who are themselves becoming adults. Beyond parenting, caregiving in families runs across generations. Middle-aged adults are often engaged in the care of their children, their aging parents, or even their grandchildren. Adults who have a parent age sixty-five or older and are also raising a child under eighteen or financially supporting an adult child are described as the sandwich generation; Pew Research Center surveys find that about 23 percent of U.S. adults fit that description, including more than half of Americans in their forties. The dual responsibility carries real costs: caring for children and aging relatives at the same time is linked with greater strain — researchers call it caregiver burden The psychological, social, and financial strain that can come with providing unpaid care to family members. Full entry → — than caring only for aging parents, and the National Institute on Aging notes that millions of Americans care for a friend or family member with a serious health condition.
Reality check: the family life cycle is a lens, not a script. Family forms vary widely. The OpenStax textbook lists single-person households, multigenerational families, blended families, same-sex parents with children, and empty-nest households among the ordinary shapes of American family life, and Pew Research Center reports that 62 percent of U.S. children under eighteen live with two married parents — an all-time low — while 26 percent live with a single parent and about 5 percent live with neither parent, most of them raised by grandparents. Families skip stages, repeat them, combine them, and invent new ones. The classic cycle was built from the mid-century picture of a married couple raising children; it describes many families, and it describes no family perfectly.
The second reality check: a family at any single moment is a snapshot of a longer story. Family-development researchers treat families as living systems — interconnected units in which a change in one member ripples through the others. When a parent's new job shifts the household schedule, children take on new chores and a grandparent's weekly call becomes the family's new anchor; the whole system rebalances. And every family carries its own history: the family you were born into shaped you, and the family you help form will keep changing after you. Seeing families as living systems rather than snapshots is what makes the life-course view honest — the point is not to file a family into a stage, but to notice that it is always, already, mid-story.
Eli explains
Explain it like I’m 10
Family development is the study of how families change over time — not just the people in them, but the family as a whole: who is in it, who does what, and how everyone is connected. A couple becomes parents; parents become empty-nesters; children become the ones driving parents to appointments. The classic family life cycle names the big stretches — formation, child-rearing, launching, later life — and it comes from family researcher Evelyn Duvall's mid-century work. Parenting is the caregiving role at the heart of the child-rearing years. And many midlife adults are in the sandwich generation, caring for children and aging parents at the same time. The honest part: no family follows the cycle like a script. Families come in many shapes, and each one is a living system — a change in one member moves everyone else.
A family is like a long-running play with the same cast but shifting roles. The people who once played "child" take on "parent"; "parent" becomes "grandparent"; the stage directions are rewritten with every new act — without the play ever closing.
The analogy breaks down because a play has a script and families do not: no director decides what happens next, and the cast changes as members join, leave, and return. A play can be performed the same way twice; no family ever is.
Follow the Diaz family through its life cycle. In 2004, Marta and Leo Diaz marry and rent their first apartment together — formation. In 2008 their daughter Sofia arrives, and by the time their son Mateo is born in 2011, the household's routines, budget, and sleep schedules all orbit the children — child-rearing. In 2026, Sofia leaves for a university two hundred miles away; Marta and Leo help with the move and keep paying her phone bill while she finishes her first year — launching. That same autumn, Leo's father, widowed and eighty-one, moves into the spare room; Marta drives him to his cardiology appointments, and Sofia video-calls him every Sunday — later life, with caregiving flowing in both directions. One family, four stages, no pause between them: the Diaz family is mid-story, like every family.
Family development is the study of how families change across the life course — formation, child-rearing, launching, and later life. The classic life cycle is a lens, not a script: families vary widely, and each family is a living system that is always mid-story.
3 questions here, of 5 in this lesson’s practice set. Answers stay hidden until you check.
"A family stops developing once the children grow up."
The later-life stages are still family development: launching children, grandparenting, and caring for aging parents are all transitions the OpenStax Lifespan Development textbook describes as part of family life in middle and later adulthood.
"Every family follows the same cycle, in the same order, at the same pace."
Family forms vary widely: Pew Research Center finds 26 percent of U.S. children live with a single parent and about 5 percent live with neither parent, most raised by grandparents, and OpenStax lists multigenerational, blended, same-sex-parent, and empty-nest households as ordinary shapes. The cycle is a lens, not a script.
"Family development is the study of individual people growing up, with the family just as a backdrop."
The unit of analysis is the family itself — its structure, roles, and relationships over time. Individual change is the lifespan-development sibling topic; family development studies the family unit's own story, which runs alongside it.
"The sandwich generation is a rare or unusual situation."
Pew Research Center finds about 23 percent of U.S. adults are in the sandwich generation — a parent sixty-five or older plus a child under eighteen or an adult child receiving financial support — and 54 percent of Americans in their forties are.
Lifespan development tracks one person from conception to death; family development tracks the family unit — its membership, roles, and connections — across the life course. The two stories run together: individual changes rearrange the family, and family changes rearrange individuals.
The classic cycle — formation, child-rearing, launching, later life — describes a common shape of family life, while a script would prescribe one. Real families skip and repeat stages, and family forms vary widely, so the cycle works best as an orienting lens.
The sandwich generation describes adults caring for an aging parent while also raising or supporting children — caregiving in two directions at once; the empty nest describes the household after children have left. A family can move between them and back again as adult children return or aging parents move in.
EliExplains lessons are original prose written from the open, credible references above. See Copyright & Licensing.
Researched 2026-08-22
Educational content only. It is not medical, legal or professional advice. Found an error? Tell us.
