The people in a person's childhood that could influence their lives would include parents, siblings, schoolmates, teachers, and friends.
How they influence our lives
Parents are the ones who give birth to us. They raise children in homes where valuable life lessons are taught. Children first learn about lives from their parents and they copy whatever they do. The first impression of a career that a child may have is from his or her parents. So, based on what they are taught they may begin to build interest in a future career from what their parents teach them.
Also, children have a strong bond with their teachers. It is not unusual to see some children saying that they want to be teachers. Based on experiences with all these people, children form their views of life and this turns out to be their personality in adulthood.