In bronfenbrenner's ecological-systems model, family and peers are part of a person's

Family and peers are part of a person's microsystem, according to Bronfenbrenner.
Urie Bronfenbrenner was a famous American psychologist of Russian descent who studied human (especially child) development. According to his ecological-systems model, our closest friends and family fall under the category of a microsystem, consisting of people very dear to us.