Final answer:
Between grades 5 and 9, adolescents' moods with friends become more positive, while moods with family may show a declining pattern due to the natural push for independence and more conflicts with family.
Step-by-step explanation:
Adolescents often experience changing moods as they transition from childhood into their teen years, particularly when it comes to the social dynamics within family and peer groups. Between grades 5 and 9, adolescents' moods while with friends become more positive, which can be attributed to the increasing importance of peer relationships and a sense of independence from family. In contrast, moods while with their families can follow a declining pattern. This may be due to the natural developmental stage where adolescents seek more autonomy and may push against parental authority, leading to more conflicts and less positive interactions within the family setting.