Developed by psychiatrist and theorist murray bowen (1913-1990) who devoted his life to the "human cause," the views families as a whole entity that are composed of interconnected parts that seek to maintain balance.

The answer is Family Systems Theory.
Family Systems Theory views the behaviors displayed by an individual couldn't be observed based solely on how they acted isolated place.
This theory believes that we could observe the true behavior of individuals by seeing how they acted/behave when they're around their loved one.

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