Final answer:
The statement is true as peer groups play a significant role in the socialization and development of a 12-year-old, influencing their behavior, attitudes, and self-perception.
Step-by-step explanation:
True or false: A 12-year-old's significant others include children who are in her peer group. This statement is true. During middle childhood, which includes the period of ages 6-10 and extends to the verge of adolescence, peer groups play a crucial role in a child's socialization and development. As children transition from playing predominantly with same-gender friends to mixed-gender groups, they still value solitary play but place increased importance on friendships. Participation in group activities, like sports teams or scouting, is common, and children demonstrate improved abilities in cooperation and sharing. These peer groups can serve to influence behavior and help establish social norms for young individuals.
The concept of a 'significant other' in social sciences often refers to individuals who have a large impact on one's self-concept and socialization. For a 12-year-old, these can definitely include peers, as peers are influential in shaping attitudes, behaviors, and self-perception during these formative years.