Now, when humanity began to multiply on the face of the earth and daughters were born to them, the princes and judges saw how pretty the girls were, and they took themselves wives from whomever they chose. [Genesis 6:1-2]
The story of any man is rooted in his father. If his father was just and honest then chances are his child will act the same way. The junior has seen the value of following G-d’s ways and will respond accordingly. And, of course, the opposite is true: A man who has seen cruelty and lies in his home will see this both as normal and necessary.