The family as a system: why one member's change moves the whole family

The fifteen-year-old has stopped talking at dinner. He answers with “yes”, “no” and “don’t know”, then disappears into his room. His mother asks questions, his father says nothing, his younger sister tries to be funny to break the silence. Everyone in this family knows who the problem is — the problem is the boy who won’t talk. And it is because of him that they have called a therapist.

That is how the great majority of first phone calls begin. Someone in the family breaks down and the others bring him in for repair. Family therapy does not argue with this account and does not try to persuade anyone that they are wrong. It only listens long enough, closely enough and honestly enough — and after a few sessions it almost always emerges that one member’s symptom did not happen in empty space. That it has its place, its function and its timetable. And that it cannot be lifted out of the family without everything else shifting.

In this post I want to explain what it means to look at a family as a system: how family balance (homeostasis) works, why a system resists change even when the change is a good one, who the “identified patient” is, why the question “who started it” has no answer, and what subsystems and boundaries are. This is not theory for theory’s sake — it is an entirely practical shift of perspective that, in the therapy room, often takes the weight of blame off a family for the first time in years.

A family is not the sum of its individuals

If you try to understand a family by adding up the characters of its members, you will always arrive at the wrong total. Every one of us knows the experience of behaving differently around certain people than we do otherwise. A grown, competent person who leads a team at work turns, within half an hour of Sunday lunch at their parents’, into a sulking teenager. A calm partner suddenly becomes boastful around his father-in-law. A sister you otherwise get on with beautifully adopts, in your mother’s presence, a stance she has nowhere else.

This is not weakness of character. This is the system. The word came into psychotherapy from biology and cybernetics — in his general systems theory, Ludwig von Bertalanffy pointed out that living systems have properties that cannot be found in any of their parts taken separately. Water puts out fire, even though hydrogen is flammable and oxygen supports combustion. The same applies to families: they contain rules, rhythms, prohibitions and duties that no individual wrote and that often nobody would sign up to, and yet everyone carries them out faithfully.

In the 1950s a group of researchers in Palo Alto, California — around the anthropologist Gregory Bateson and the psychiatrist Don D. Jackson — began observing families instead of individuals. Their central discovery was simple and, for its time, almost heretical: behaviour that looks senseless in an individual becomes meaningful the moment you put it back into the relationships in which it occurs. The same sentence that sounds like pathology in a consulting room sounds, in the family kitchen, like the only possible move.

Out of this grew the whole of family and systemic therapy — the approach I work in myself, and which I introduce in general terms in the post on marriage and family therapy. Its starting point is that you do not understand a symptom until you know the relational field in which it appears.

Homeostasis: the balance the system defends

The most useful concept Jackson brought into this field is family homeostasis. In an article published in 1957 he described something he had noticed while working with hospitalised patients: when a patient’s condition improved, the condition of someone else in the family often got worse. The husband recovered — the wife fell ill. The child settled down — the parents began to separate. As though the family had a thermostat making sure the amount of tension in the system stayed roughly the same.

Homeostasis is not in itself a bad thing. It is essential. A family that could not return to balance would fall apart at every upheaval. It is thanks to this mechanism that families survive moves, job losses, illnesses and deaths. The trouble begins when the balance the system defends costs someone too much — when the stability of the whole is paid for with one member’s symptom.

In practice it looks like this. There is tension between the parents that nobody puts into words — a disappointment that has lasted for years, or an estrangement that is not safe to talk about. As long as the child is in trouble, that tension has no room: the parents have a shared task, a shared worry, a shared subject. They cooperate. When the child recovers, the empty space between them opens up again. And then — often entirely unconsciously, with no ill intent on anyone’s part — something happens that pushes the child back into the role of the one with whom something is wrong.

Nobody does this on purpose. That is the most important sentence in this post. Homeostasis does not operate at the level of intentions but at the level of patterns — just as you cannot intentionally speed up or slow down the healing of a wound. Which is also why looking for someone to blame makes no sense; more on that in the post on looking for the pattern instead of the culprit.

The identified patient: who carries the symptom for everyone

In systemic language, the person the family brings in as “the problem” is called the identified patient. The term sounds cold, but its intent is warm: it points out that this is the person who has been identified as the bearer of the trouble, not necessarily the person in whom the trouble arose.

The identified patient is often the most sensitive member of the family. Not the weakest — the most sensitive. The one who picks up fastest on tension nobody mentions, and who then expresses it in the only way available: through behaviour, through illness, through slipping at school, through anger, through withdrawal. Children have a remarkable radar for this. They pick up precisely what adults hide most carefully, and often express it before they could name it.

This does not mean the symptom is not real. Depression is real, an eating disorder is real, anxiety is real, and each of them needs appropriate professional treatment. The systemic view does not replace a diagnosis and does not diminish suffering — it adds a question that individual treatment often does not ask: in what field of relationships does this symptom live, and what happens in that field when the symptom eases?

When a family hears that question for the first time, one of two things usually happens in the room. Either there is relief — because the burden is suddenly shared out and the identified patient is, for the first time, not alone. Or there is tension — because the question is very close to something that has not been talked about until now. Both are useful. Both are the beginning of the work.

Circularity: why “who started it” has no answer

In everyday thinking we are used to linear causality: A causes B. The mother nags because the son withdraws. Or the other way round: the son withdraws because the mother nags. Each of them has their own version, and from where each of them stands, each version is entirely logical.

The systemic view says both versions are true and both incomplete — because this is a circle. The mother nags, the son withdraws because the nagging hems him in; from the withdrawal the mother concludes she is losing contact, so she presses harder; the son withdraws further. Nobody started it. More precisely: who started it is a question about history that cannot be resolved and that changes absolutely nothing. Something else is interesting — what keeps this circle turning today, and who can make a different move at which point.

We call this circular causality, and it is probably the most liberating idea in the whole of family therapy. It removes the moral weight without removing responsibility. Nobody is to blame — but everyone has their own share of the circle, which they can change. And because it is a circle, it is enough for someone to interrupt it persistently enough at one point for the whole circuit to change.

Subsystems and boundaries: who is with whom, and where the doors are

The Argentinian psychiatrist Salvador Minuchin, the founder of structural family therapy, pointed out that every family is not a single group but a series of smaller units: the partner subsystem, the parental subsystem, the sibling subsystem, sometimes a grandparent subsystem. Each has its own task, and between them run boundaries — invisible lines that determine who takes part in what, and in what way.

Boundaries are not walls. They are best imagined as doors: some open, some ajar, some locked. A family’s healthy functioning depends on the doors being in the right places and on their being openable and closable as needed. Minuchin described two poles between which families in distress oscillate:

• Enmeshed (diffuse) boundaries. There are almost no doors. Everyone knows everything about everyone, one member’s feelings immediately become everyone’s feelings, privacy looks like betrayal. A child becomes one parent’s confidant, partner matters are settled in front of the children, a mother knows every thought her teenager has. In such families there is a great deal of closeness and very little room — and the separating that is essential to growing up is experienced as a rejection of love.
• Rigid boundaries. The doors are locked. Everyone operates for themselves, feelings are not talked about, help is neither asked for nor offered. The family looks orderly and self-sufficient, but nobody really has support from anyone. A child who falls in such a family usually picks themselves up alone — and at the same time learns that support does not exist.
• Clear boundaries. In between. The parents have a space of their own that the children do not have access to, the children have theirs that the parents do not enter without reason, and between them movement is possible — of information, help, tenderness. This is not an ideal state that anyone maintains all the time. It is a direction.

A very common form of a broken boundary is the triangle: two members relieve their tension by drawing a third into it. The child who mediates between the parents; the daughter her mother tells about her father’s failings; the son who becomes his mother’s partner in everything but bed. Triangles are stable and therefore very persistent — I write about their geometry in more detail in the post on siblings, alliances and coalitions.

Why a system resists change, even good change

You have probably experienced this already. You spend a few months working on yourself, you set a boundary, you say no for the first time in your life — and instead of relief you get a wave of reactions. Someone takes offence. Someone falls ill. Someone says: “Ever since you started seeing a therapist you’ve been completely different.” This is not a sign that you have made a mistake. This is homeostasis at work.

The system does not distinguish between good and bad change. It distinguishes between the familiar and the unfamiliar. A pattern that has provided predictability for decades loosens everywhere when one of its links changes — and everyone else starts, entirely automatically, doing the things that used to return the situation to its previous shape. In family therapy we also call this response “first-order change”: the system reshuffles itself, but the rules stay the same. Only second-order change — a change in the rules themselves — is the kind that holds.

That is why I always prepare people who begin working on themselves in therapy within a strong family field for this wave. It is not pleasant, but it is important information: it means you have moved enough for things around you to move too. How to stay yourself in such a wave without having to cut yourself off from your own people is exactly the subject of the post on differentiation — Bowen’s term for the capacity to stay in contact and stay a person at the same time.

What this means for therapy

If a family is a system, then therapy has two pieces of good news. The first: nobody is broken. The second: nobody is powerless. A system in which everyone is connected is, after all, a system in which everyone can shift something — including the person with the least power and the least say.

In practice this means three things:

• One person’s change moves everyone. Not everyone has to change at once. It is enough for one person to stop doing their part of the circle persistently enough. That is exactly why therapy that only one person comes to also makes sense — more on that in the post on what happens when only one of you is willing to come.
• The symptom is not an enemy but information. The question is not only how to get rid of it, but also what in the family sustains it and what would happen if it disappeared. This is not making excuses — it is the way to ensure it does not come back through another door in another member.
• The balance has to be replaced, not just dismantled. A family that gives up its old pattern needs help assembling a new way of being together. Otherwise the old one returns, because it was the only one they knew.

With me, joint sessions take place within family therapy; I am a therapist in training in marriage and family therapy and I work under regular supervision, which means there is another pair of eyes behind what happens in the room. What such a session actually looks like — who comes, who speaks first, what I do — I described in the post on how joint sessions run.

The systemic approach also has a solid research base. The evidence reviews Alan Carr prepared for the Journal of Family Therapy show good effectiveness for systemic and family interventions across a range of child and adolescent difficulties — from conduct disorders and eating disorders to adherence in chronic illness — and in adult problems where the relational context matters. Family therapy, then, is not a softer version of “real” treatment. It is a different level of intervention: the level at which the field is repaired, not the individual within it.

If you recognise yourself in this

Perhaps while reading you have thought of someone in your own family. Perhaps you have thought of yourself — that you were the one who carried the symptom, or the one who spent a lifetime making sure there was peace at home. Both are common and both are worth looking at.

When I work with families, this moment almost always comes: someone says a sentence nobody in that room has ever spoken, and for a few seconds it is very quiet. In that silence the system shifts a little. Not for good and not enough — but enough for everyone to see that a shift is possible.

If you are not sure whether your distress is an individual matter or a family one, that is a perfectly legitimate starting point for a first conversation; when it is time for one, I described in the post on the right moment for therapy. Or you can simply write to me and we will work out together who should come in the first place.