Changes in emotion, self-perception and interpersonal relationships with families, peers and friends are studied under __________ domain of development.

The correct option is Psycho-social.

Human development is broadly classified into three major domains:

1. Physical Domain: Involves bodily changes, growth, motor skills, and health.

2. Cognitive Domain: Involves mental processes such as thinking, learning, memory, reasoning, and language development.

3. Psycho-social Domain: Focuses on emotional changes, self-understanding, personality, and social interactions with family, peers, and friends.

Since the question specifically addresses changes in emotion, self-perception, and interpersonal relationships, these aspects fall directly under the Psycho-social domain of development.