How unpaid family care became a subject
A social history of care within households: assumed for centuries, discussed publicly only recently.
For most of recorded history, care within a household was not a subject. It was not discussed, studied, named or counted, because it was not understood as a distinct activity. It was simply what a household was: a group of people of different ages and capacities living together, in which the more able attended to the less able as a condition of living at all.
The interesting historical question is therefore not when families began caring for one another, which is not a question at all, but when this began to be visible as something separate from ordinary domestic life, and why that took so long.
The household as the unit
In agrarian and early urban societies, the household was the unit of production as well as of residence. Work and dwelling occupied the same rooms. Under those conditions, attending to a relative who could not work was not a departure from the working day, because the working day had no boundary to depart from. It was absorbed into a continuous domestic and productive routine, distributed among several adults, and largely invisible to anyone outside.
This absorption is the reason so little was written about it. Activities become describable when they interrupt something, and care interrupted nothing that had a name.
What separation of work and home changed
The industrial reorganisation of work moved production out of the house and into places that kept hours. That change did more to make family care visible than any argument about it, because it created, for the first time, a straightforward conflict: the place of work and the place of the person needing care were now different places, at the same time of day.
Once that conflict existed, someone had to remain. Which member of the household remained was decided by the conventions of the period rather than by anything about the task, and the consequences of that allocation shaped the next century and a half of assumptions about who cares.
Longer lives, longer arrangements
The other structural change was duration. As lifespans lengthened across the twentieth century, the period during which a person might need substantial daily support extended from something measured in weeks or months to something that could last many years.
This changed the character of the thing entirely. A short arrangement can be absorbed by goodwill and improvisation; a decade cannot. Much of what is now discussed as the practical problem of caring, the division of labour, the rota, the need for regular relief, arises directly from that extension of duration, and would have been largely unnecessary in a period when these arrangements were short.
Smaller and more distant households
At the same time, households became smaller and relatives more geographically dispersed. Where care had once been distributed across several adults in one dwelling, it increasingly fell to one or two people, often with other relatives at a distance who wished to help and had no obvious mechanism for doing so.
This is the specific configuration most families now recognise: a great deal of willingness spread across a wide geography, and a very concentrated load in one house. Nearly all the practical difficulty families experience today is a consequence of that shape, rather than of anything about the care itself.
Becoming a subject
Only in the later twentieth century did the activity acquire a general name, and with the name came the possibility of talking about it as a common experience rather than a private domestic circumstance. That shift matters more than it appears to. Before it, a person doing this work had no category to place themselves in, and consequently no reason to expect that anyone else's household resembled their own.
The naming did not reduce the work. What it changed was the isolation: it made it possible for people to recognise a shared situation, to compare arrangements, and to state a difficulty in general terms rather than as a peculiarity of their own family. That is a modest historical development, and for the people inside it, not a small one.