A collection of invidividuals who have relations with one another to make them interdependent to some significant gruop.

group

Explanation:

A group is simply defined as the invidividuals who have a connection with one another and are related with one another and this makes them interdependent.

The influence of ones group can either have a positive or negative impact on a person. For example, if the people in ones group smokes, one can eventually start smoking as well.