What do you think is the most important influence on a person's personality and social behavior?

As there is no outstanding influence on a person's behavior - rather a combination of influence that result in a unique, yet categorizable nature. (Yes, I just made that word up hahaha). The main influences would be a person's position in society; whether their in the high, middle or low classes. The people around them/ the people who have been with them in their younger years. A person is most likely to act or behave a certain way depending on their collegues or role models. Also is the social pressure from friends or family or relationships etc... The closer a person is to someone, the more willing they are to do things to please said someone or gain their favour/ acceptance. At last, but the least, is the values instilled within them. Lets say from a young age, a child was taught to be upright, but somewhere along the way has fallen into less favorable situations. That child will still try to uphold what moral character was instilled in him or her despite a contradictory environment - or at least for some time. #ithinkhahaha