Two siblings can grow up in identical environments and as adults, one develops a psychological disorder and the other does not. Psychologists have taken biological, psychological, and environmental factors and explored how these factors relate to each other in order to explain the above situation. This is called the

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The vulnerability-stress model (also known as the diathesis-stress model) explains how the interaction of biological vulnerability (or predisposition) and environmental stressors can lead to the development of psychological disorders. This model is relevant to the scenario where two siblings, despite sharing the same environment, may have different outcomes in terms of psychological health due to their unique biological vulnerabilities and experiences of stress.

Two Siblings Can Grow Up in Identical Environments and as Adults