Here are a few points to consider:
1. All cultures are different and cultures have a profound influence on people. Culture shapes their thoughts, dream, logic and so on.
2. In light of point one, culture has a lot to do with the personality of a child. Culture educates a child in some of the basic aspects of life. What is acceptable, what is unacceptable, what is natural, what is unnatural, etc.
3. Culture also reprimands a child when he or she does not comply through various pressures and inducements.
4. I do not wish to imply that there are no other factors, such as the temperament of the child, but I want to emphasize the importance of culture.
For more reading on this topic, read Social Construction of Reality by Peter Berger and Thomas Luckman