As global human health has vastly improved in recent centuries, intact two-parent biofamilies are becoming the norm except in war-torn and disease-dominated societies.
Each organ in the system of your body is a subsystem.
Each household of kids and adults is a subsystem of your larger multi-generational family system.
A high-nurturance family consistently fills all these adult and child needs well enough.
Any family may be judged to be somewhere between "very low nurturance" (dysfunctional) and "very high nurturance" (functional).
occurs when any perceived behavior of one person or personality subself significantly affects another person or subself spiritually, psychologically, mentally, or physically. Because All behavior aims to reduce or prevent physical, emotional, mental, and spiritual discomfort (needs).