In a recent issue of the New Yorker magazine, an article titled "Do Parents Matter?" discussed the work of Judith Rich Harris and her assumption that children's peers are more influential in their development than their parents.
The "peer influence" theory may gain enthusiastic support from many troubled parents who would prefer to believe that they aren't really responsible for causing or correcting their child's problems.
This idea is quite a contrast to Alfred Adler's beliefs that the mother, father, siblings, organ inferiority, culture, or gender role may have a seminal influence on a child's development. There is still much debate over nature and nurture, however, Adler stands out for his unique perception of the "creative power" of the child as the decisive influence.
Somewhere within the third to fifth year, the personality prototype is formed. After that crystallization, the child "selects his influences" in line with his personality ideal. Mistakes are common, but a combination of adult love, insight, and encouragement can often redirect a child into a more positive way of living.
For more information about Adlerian child guidance, check:
http://ourworld.compuserve.com/homepages/hstein/tree.htm
http://ourworld.compuserve.com/homepages/hstein/guid.htm
http://ourworld.compuserve.com/homepages/hstein/child.htm
http://ourworld.compuserve.com/homepages/hstein/parentin.htm
http://ourworld.compuserve.com/homepages/hstein/atmosph.htm