Final answer:
Differentiation of Self in Family Systems Theory refers to the process of individuation and separating one's thoughts and emotions from family influences.
Step-by-step explanation:
In Family Systems Theory, the concept of 'Differentiation of Self' refers to the process of individuation and separating one's thoughts and emotions from family influences. It involves developing a sense of self that is independent of family dynamics and being able to maintain one's own beliefs and values while still maintaining healthy relationships with family members.