I'm talking mostly about the personality of a person. I have heard some people say that when you adopt a child, you don't know what kind of genes he or she has, so its hard to predict whether the person will turn out to be a thief or a normal person. Do genes actually determine what kind of a person a child would be or is it all upbringing?
How about children who turn out to be totally different than their parents?
Is most of the personality of the child shaped in the first 5 years of life (I've read this in many articles) or is a child born with some personality traits?