I think a persons upbringing can have an effect on them at some point in thier lives but not always. It depends on the persons character.

If someone was brought up in a family that lies, cheats and steal etc theres nothing to say that the person will grow up the same way, they might see the errors of their familys ways and turn out to be a pretty decent person.

I remember reading in the papers about a baby boy who had been mistreated by his parents, he was kicked, biten, beaten to his death and health professionals later said that, if he had survived he would of grown up a unstable person because of what happened to him as a child.
I don't agree with that tho, I believe if the child had survived and recieved the right help and found a home with a loving family, then he may of turned out to be alright.