Triangulation: How Narcissistic Parents Use You Against Each Other

FAMILY DYNAMICS & BOUNDARIES • April 9, 2026

The Message She Wasn’t Supposed to Tell You

You’re sitting at the kitchen table, the late afternoon sun casting long shadows across the worn wood. Your sister’s voice is tight, cautious, the way it always is when you’re in the same room but worlds apart. Your mother hovers nearby, her eyes flicking between the two of you like a referee in a match you never agreed to join. The tension is palpable — thick enough to touch.

Then your mother leans in, her tone casual but loaded, and says, “Your sister told me you’re selfish and difficult.” Your heart sinks. You glance at your sister, who looks away quickly, cheeks flushed. Later, when you call your sister, her voice cracks. “Mom said you told her I was a failure at parenting.” Neither of those conversations ever happened between you and your sister. They’re fabrications — and yet, they’ve built an invisible wall between you.

The silence that’s settled in the years since is deafening. Four years of no calls, no texts, no shared memories, just echoes of those whispered, twisted messages. You replay the moments, wondering how a love that once felt so steady became riddled with suspicion and pain. This isn’t just a family argument. It’s a carefully orchestrated pattern of manipulation called triangulation.

Nadia, a data scientist in her mid-30s, describes a version of this story that took her years to understand. “My mother was the only channel between me and my brother for most of my adult life. I didn’t realize that everything she told me about him — and everything she told him about me — had been filtered, shaded, sometimes entirely invented. We’d been estranged for three years based on conversations that never happened.” Understanding what had actually been going on — and that she and her brother had both been played — was, she says, “one of the most clarifying and devastating realizations of my life.”

What Is Triangulation?

Triangulation is a family dynamic where a third person is drawn into tension between two others, often to stabilize anxiety or avoid direct confrontation. In healthy families, triangles may naturally form and resolve without lasting harm. But in narcissistic family systems, this process becomes weaponized.

Rather than supporting open communication, the narcissistic parent uses triangulation as a control strategy. They position themselves at the center of all communication — playing siblings off against each other, fostering mistrust, and managing loyalty like a currency. The siblings become unwitting players in a game where the rules are constantly shifting, and the prize is parental approval. The tragedy is that both siblings are usually operating in good faith, responding to information they have no reason to question — because it came from their parent.

Imagine trying to navigate a relationship with your sister when every piece of information you have about her inner life came filtered through your mother. Every resentment, every concern, every piece of praise — all of it went through her first, and came out the other side shaped by what served her narrative. You can’t build a genuine relationship on information that’s been edited. That’s by design. The betrayal trauma framework helps explain why this kind of manipulation by a trusted parent is so particularly devastating: the harm comes from the person who was supposed to protect you from it.

The Psychology of Triangulation in Narcissistic Family Systems

Triangulation as a concept originates from family systems theory, pioneered by Murray Bowen, MD, who observed this pattern as a way family members manage anxiety within relationships. Bowen saw triangles as the smallest stable relationship unit, where tension between two people is diverted by involving a third. This mechanism often serves to diffuse conflict temporarily but becomes dysfunctional when the triangulation becomes chronic and controlling.

Structural family therapist Salvador Minuchin, MD, built on these ideas, emphasizing the role of cross-generational coalitions — alliances that cut across generational boundaries, pitting children against parents or siblings against each other. Minuchin highlighted how such coalitions destabilize family boundaries and create lasting dysfunction. In narcissistic family systems, the cross-generational coalition often takes the form of the narcissistic parent aligning with one child against another — which is the classic golden child/scapegoat dynamic in its most basic form.

How Triangulation Shows Up in Adult Sibling Relationships

Sibling relationships often bear the brunt of triangulation’s corrosive effect. The dynamic is subtle but persistent: tension and mistrust simmer beneath the surface, shaped by the narratives your narcissistic parent controls. You might feel like you’re constantly defending yourself or second-guessing your sibling’s intentions. Sometimes you’re left wondering: did that really happen, or is it just the story I was fed?

Maya describes watching her relationship with her sister deteriorate in slow motion over a decade. “Every time I visited home, I came back with new information about how my sister had apparently been criticizing me. And every time my sister visited, she apparently came back with new information about me. We stopped trusting each other completely. I didn’t realize until I was in my 40s that neither of us had actually said any of those things.” The estrangement had been built entirely from fabrications, passed through the same hands, serving the same function: keeping both daughters competing for maternal approval rather than forming an alliance that might have allowed them to see the pattern clearly.

Driven, ambitious women are often particularly affected by triangulation in professional contexts, too. The same dynamic plays out in workplace settings where a manager operates as the central information node — filtering, shaping, and distorting what each team member knows about the others. If you’ve found yourself in a professional environment that feels like it has the same quality as a narcissistic family system, understanding triangulation can be illuminating. The patterns transfer almost perfectly. Trauma-informed executive coaching can help you navigate these dynamics with clarity.

Triangulation and Flying Monkeys: When Other Family Members Become Instruments

One of the most painful extensions of triangulation is the flying monkey phenomenon — when other family members (aunts, uncles, cousins, even the other parent) are recruited to deliver messages, apply pressure, or enforce the narcissistic parent’s narrative. These individuals are often acting in good faith, genuinely believing the version of events they’ve been given. This makes the situation simultaneously more complex and more painful: you’re being harmed not just by the narcissistic parent, but by people who love you and don’t know they’re being used.

Nadia experienced this through her grandmother, who would call with what felt like concerned check-ins but were actually transmission vehicles for her mother’s narrative. “My grandmother wasn’t a bad person. She just completely believed my mother’s version of everything, because my mother had been managing that relationship for years. My grandmother was flying a flag she didn’t even know she was carrying.” Disentangling care from control — recognizing that someone can be genuinely loving and still unwittingly harmful — is some of the most nuanced work in recovering from triangulated family dynamics.

Understanding the flying monkey phenomenon also helps explain why extended family members often take the narcissistic parent’s side in family conflicts. It’s not necessarily because they’re colluding — it’s because the narcissistic parent has been managing their perceptions for years, and they’re responding to information they have no reason to question. This doesn’t make their behavior acceptable. But it does make it comprehensible, which is helpful for navigating the inevitable family politics of healing. If you’re working through these family dynamics, individual therapy offers a space to sort through the complexity without having to manage anyone else’s feelings about it.

Both/And: You Can Recognize Triangulation and Still Love Your Sibling

One of the most important things to hold as you begin to understand the triangulation in your family is that recognizing the dynamic doesn’t require you to stop loving your siblings or to view them as co-conspirators. In most cases, they were in the same system you were — also being manipulated, also receiving distorted information, also operating from a position of incomplete knowledge about what was actually being done to the relationship.

You can grieve the sibling relationship that was undermined and still want to repair it. You can be angry about the years of estrangement and still recognize that your sibling wasn’t the architect of it. You can name clearly what the parent did and still feel love for everyone involved. None of these truths cancel the others. The both/and framing is essential here, because the triangulation was specifically designed to make you think you had to choose — loyalty to the parent or loyalty to the sibling. That framing itself is part of the manipulation.

Nadia’s most meaningful step in healing was reaching out to her brother directly — not to relitigate the past or to compare notes exhaustively, but simply to say: “I think we were both being managed by the same person. I’d like to know you without her in the middle.” That conversation, she says, was one of the most healing of her adult life. Not because it resolved everything, but because it allowed a direct relationship — unmediated, unfiltered, finally real — to begin. Fixing the Foundations includes specific work on navigating complex family relationships as part of the healing process.

The Systemic Lens: Why Triangulation Is So Effective at Keeping Children Divided

Triangulation works so effectively because it exploits something fundamentally human: our deep need for a trusted source of information about the people we love. In healthy family systems, parents provide that trusted narration of reality — helping children understand each other, modeling direct communication, and reinforcing sibling bonds. When a parent weaponizes that trusted position, the damage is particularly profound because it targets the very mechanism children rely on to make sense of their closest relationships.

The effectiveness of triangulation is also sustained by the family system’s general resistance to having its dynamics named. Naming triangulation — especially naming the parent as the source — threatens the family’s equilibrium and the parent’s central position within it. This creates significant pressure on adult children to maintain silence, to attribute the sibling conflict to the siblings themselves rather than to the parent who orchestrated it, and to continue operating within the frame the parent has established.

Cultural expectations compound this further. The ideal of family loyalty — “you don’t air dirty laundry,” “family comes first,” “she’s still your mother” — makes it genuinely difficult for adult children to name the systemic manipulation without also violating deeply held norms. What I see consistently is that these norms do real work in protecting the narcissistic parent’s position, and that part of healing is developing the capacity to honor family bonds in a new way — one that’s grounded in honesty and genuine care rather than loyalty to a narrative that’s been built on distortion. The Strong & Stable newsletter addresses these cultural pressures regularly.

Breaking Free of the Triangle

Breaking free of triangulation begins with a commitment to direct communication — bypassing the parent as the information intermediary and building direct channels with your siblings. This sounds simple and is often quite difficult, particularly if the sibling relationship has been damaged by years of distorted information and resulting mistrust. It requires both parties to be willing to question the information they’ve been given, and to hold the possibility that their perception of the other was significantly shaped by a third party.

In therapy, this work often involves naming the structure itself — developing the capacity to recognize triangulation in real time, to identify when information is being passed through an intermediary in ways that serve that intermediary’s needs rather than yours, and to choose direct contact over the triangulated channel. This is an ongoing practice, not a one-time conversation. The narcissistic parent will often attempt to re-insert themselves into the direct channel once it’s been established. Maintaining direct sibling relationships in the face of that re-insertion requires conscious, consistent effort.

What becomes possible when the triangle dissolves is genuinely healing. Nadia describes her relationship with her brother now — two years after that first direct conversation — as “the most honest relationship I have in my family.” They don’t talk every week. But when they do, the conversation is real: their actual experience, their actual feelings, their actual relationship with each other rather than the one their mother built for them. That’s what breaking free of the triangle makes possible. You can begin that conversation with Annie here.

Recovery from this kind of relational pattern is possible — and you don’t have to navigate it alone. I offer individual therapy for driven women healing from narcissistic and relational trauma, as well as self-paced recovery courses designed specifically for what you’re going through. You can schedule a free consultation to explore what might help.

Related Reading

Bowen, Murray. Family Therapy in Clinical Practice. Jason Aronson, 1978.

Minuchin, Salvador. Families and Family Therapy. Harvard University Press, 1974.

Herman, Judith. Trauma and Recovery: The Aftermath of Violence — From Domestic Abuse to Political Terror. Basic Books, 1992.

Malkin, Craig. Rethinking Narcissism: The Secret to Recognizing and Coping with Narcissists. HarperWave, 2015.

Medical Disclaimer

Medical Disclaimer