The concept of who is considered "in" the family and who is "out" is termed:

Question

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The concept of who is considered "in" the family and who is "out" is referred to as family boundary. Family boundary refers to the physical and emotional boundaries that define the members of the family and their relationships with each other, as well as their relationships with the outside world. It includes the rules and expectations that define the roles, responsibilities, and relationships of family members within and outside the family.

The Concept of Who Is Considered "In" the Family and Who