Genogram symbols are the standardized shapes and lines therapists use to map a family across generations, showing not just who’s related to whom, but how close, distant, or strained those relationships are. Squares represent men, circles represent women, and different line styles show marriage, divorce, conflict, or emotional cutoff. Once you know the basic vocabulary, a genogram turns a family’s entire history into something you can read at a glance.
If you’ve ever seen a family tree, you already understand the starting point. A genogram takes that same idea and goes much further. It doesn’t just show who’s born to whom. It shows the emotional texture of every relationship in the diagram, which is exactly why therapists, social workers, and medical professionals rely on it as a working clinical tool rather than a keepsake.
What Is a Genogram, and Why Symbols Matter
A genogram is a structured diagram of a family, usually spanning at least three generations, that captures both the facts of a family’s structure and the emotional patterns running through it. Psychiatrist Murray Bowen introduced the concept in the 1970s as part of his broader work on family systems theory, and clinicians Monica McGoldrick and Randy Gerson later expanded and standardized the symbols most professionals use today.
The symbols matter because they carry real clinical meaning. A therapist glancing at a properly built genogram can immediately spot a family history of addiction, a pattern of estrangement repeating across generations, or an unusually high concentration of a particular illness. None of that information would be visible in a plain family tree. The symbols are what turn a genealogy chart into a diagnostic and therapeutic tool.
Basic Genogram Symbols: People
Every genogram starts with the same foundational shapes.
- Square: represents a male family member
- Circle: represents a female family member
- Diamond: used in some formats for a family member whose gender isn’t specified or known
- Double square or double circle: marks the identified patient, the individual the genogram was built to understand
- A line through a square or circle: indicates that person is deceased
- An X inside the shape: an alternate way some clinicians mark death
Age is typically written inside or beside each shape, and names or initials sit just below. Twins are shown as two shapes connected by a short diagonal line back to a single point on the parents’ line, with a horizontal line between them if they’re identical.
Family Relationship Symbols
These symbols connect people and describe the legal or formal status of a relationship. By convention, the male partner is placed on the left and the female partner on the right, connected by a horizontal line.
- Solid horizontal line: marriage
- Dashed horizontal line: cohabitation or a committed relationship without marriage
- Single diagonal slash through the line: separation
- Double diagonal slash: divorce
- Multiple marriage lines: shown by connecting the same person to different partners with separate lines, usually numbered in order
Children are shown branching down from the relationship line, typically listed left to right in birth order. A vertical line with a triangle or specific shading is often used to represent a pregnancy, and different symbols indicate a miscarriage, stillbirth, or adopted child, usually a dashed line connecting the child to the family for adoption, to distinguish it from a biological connection.
Emotional Relationship Symbols
This is where a genogram becomes far more useful than an ordinary family tree. Emotional relationship lines are drawn directly between two people, separate from the family-structure lines beneath them, and they describe the quality of the bond.
- Single straight line: a close or friendly relationship
- Double or triple line: a very close, sometimes enmeshed relationship
- Wavy line: conflict or a strained relationship
- Line with a slash: a distant or cutoff relationship, where contact has been broken
- Line with arrows: describes a one-directional or unequal dynamic, such as a controlling or overly focused relationship
Some clinicians add color coding on top of these lines, for example, red for conflict and blue for closeness, particularly when a genogram grows complex enough that line styles alone become hard to scan quickly.
Medical and Life-Event Symbols
Because genograms were adapted for medical and psychiatric use, many practitioners add symbols to track health history alongside emotional patterns.
- Shading or a specific pattern inside a shape: marks a diagnosed medical or psychiatric condition, often labeled directly (for example, “depression” or “diabetes” written beside the shape)
- A small icon or abbreviation: notes substance use, chronic illness, or hospitalization
- Arrows pointing to a shape: sometimes used to flag a significant life event tied to that person, such as a major trauma or a career change that affected the family
This layer is especially valuable in a clinical intake, since it lets a therapist or physician see, in one view, whether a client’s current struggle echoes a pattern already present in their family history.
How to Build a Three-Generation Genogram
Most genograms are built to span at least three generations, since patterns rarely become visible in just one or two.
- Start with the identified patient. Place them near the center of the page and mark them with a double square or circle.
- Add their immediate family. Parents, siblings, spouse, and children go directly around them, connected with the relationship symbols above.
- Expand upward. Add grandparents and any aunts or uncles who are relevant to the family’s story.
- Layer in emotional relationships. Once the structure is in place, go back and add the emotional-relationship lines between key people.
- Note significant events and health history. Add symbols or brief labels for major illnesses, losses, or life transitions that came up during the family’s history.
- Review it together. A genogram built collaboratively with a client or family, rather than handed to them finished, tends to surface far more insight, since the process of building it often triggers memories and connections on its own.
It doesn’t need to be perfect on the first attempt. Genograms are meant to be revised as therapy continues and new information surfaces.
Common Mistakes to Avoid
- Skipping the emotional layer. A genogram with only names, dates, and marriage lines is really just a family tree. The emotional relationship symbols are what make it clinically useful.
- Overcomplicating the first draft. Trying to capture every detail in one sitting usually produces a cluttered, hard-to-read diagram. Start with structure, then add detail in layers.
- Inconsistent symbols. If a wavy line means conflict in one part of the diagram and something else elsewhere, the genogram stops being readable, even to the person who made it.
- Leaving out context for symbols. A shaded shape with no label just says “something happened here.” A short note beside it turns that into useful clinical information.
Why Genograms Matter in Family Therapy
A genogram isn’t just documentation. It’s often a turning point in therapy itself. Families frequently discover, while building one, that a pattern they assumed was unique to them, a divorce, an estrangement, a struggle with alcohol, has actually shown up in earlier generations too. Seeing that pattern laid out visually tends to reduce shame and blame, since it reframes the issue as something the family has been carrying, rather than something any one person caused.
This is exactly why Bowenian family therapy, and increasingly family therapists working from other models too, treat the genogram as a starting point rather than a one-time assessment. A well-built genogram becomes a shared reference the family returns to throughout treatment, updated as new information and new insight emerge.
Related reading on Thought Mending: Family Therapy techniques for how genograms fit alongside reframing, tracking, and other core techniques, Family therapy activities for communication, and Different Schools of Thought in Psychology for the theory behind Bowenian family systems work
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