Which term applies to people treated as if 'real' kin even though they are fully understood not to be 'real' kin by the culture's standards?

Question

Quizplus · Accepted Answer

Classificatory kin refers to people who are treated as if they are real kin, even though they are not biologically related, but are classified as such within a particular culture. For example, in some cultures, all members of the father's clan may be called "brother" or "sister," even though they are not biologically related.

Which Term Applies to People Treated as If 'Real' Kin