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perverse triangle

This refers to a pathological relationship structure between three persons, in which two persons on different hierarchical levels form a coalition (alliance/coalition/alignment) against the third. This alliance typically takes the form of an overstepping of generational boundaries, with one parent and a child in coalition against the other parent.

Definition extracted with permission from Simon, Fritz, et al, Family Process, Inc.: Language of Family Therapy: A Systemic Vocabulary and Source Book (Family Process Press Series)


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