Triangles: How Families Handle Tension

A therapist once said, “In families, tension rarely stays between just two people.” One sibling snaps, and suddenly a third person walks in, cracks a joke, changes the subject, or takes sides. The fight cools off—for now. But why does that relief so often come with a hidden cost?

In family systems theory, that “third person” has a name: a triangle. It’s the smallest stable unit in a relationship system—two people plus a third person, activity, or issue that absorbs some of the emotional heat. Under stress, most pairs don’t stay a pair for long; they widen the circle. One complains to a sibling, vents to a friend, throws themselves into work, or suddenly focuses on a child’s grades or behavior. On the surface, things look calmer. Underneath, the original tension is still pulsing, just spread out. Over time, these patterns can become so automatic that each person starts to occupy a familiar role without thinking. In this episode, we’ll look at how those roles form, why some people get pulled in more than others, and what it actually means to step out of a triangle without abandoning anyone.

Some triangles are obvious: two parents arguing, a child crying in the doorway. Others are quiet—like a parent who always “checks in” with one child after fighting with their partner, or a teen who suddenly develops stomach aches whenever adults are at odds. Research finds that when kids are repeatedly placed in the emotional crossfire, their bodies often carry the stress: sleep problems, headaches, anxiety, or shutting down. Over time, nobody has to say, “You’re on my side.” The glances, tone shifts, and who gets texted first after an argument start to map out the real alliances in the room.