Which theory posits that every member of the family is interrelated and affects the others?

• A. Structural Theory
• B. Systems Theory
• C. Family Systems Theory
• D. Interpersonal Theory

Answer: (C)

The idea being tested is that a family functions as an interconnected system where each member influences and is influenced by the others. This perspective says that actions, moods, or changes in one person ripple through the whole family, reshaping patterns of interaction, roles, and boundaries. That’s exactly what Family Systems Theory focuses on: the family as a unit with interdependent parts, where circular causality and recurring interaction patterns determine overall functioning.

Why this fits best: Family Systems Theory specifically applies the notion of interrelated members to families, examining how patterns of communication, boundaries, and roles create or dissolve family dynamics. It explains why a change in one member’s behavior doesn’t stay isolated but instead affects the family as a whole. While Structural Theory looks at arrangement and roles within the family, and Interpersonal Theory centers on dyadic relationships, and Systems Theory is a broader framework, the family-focused version captures the reciprocal, whole-system nature described in the question.