A huge factor in the child's later life is the emotional well-being of their family. For example, families with parents that suffer from mental disorders, etc. will generally have a more negative effect on the child in later life. Also, the income and comfort of living the child experiences growing up will probably have an impact. More money generally puts less stress on the parents and the children, so they will have a stronger relationship and the child will tend to be happier later in life.
I agree. I think that even if a child starts off with a strong relationship with his parents, if some big event in the family occurs that changes the entire well-being of the family, it could greatly alter how the child grows up. Although financial stability makes it easier to have a good relationship, I do not think that it is necessary to have a strong relationship between kids and parents. In some cases, it definitely hurts the relationship, but in others, I would argue that it might make the bond even stronger.
I completely agree that the emotional-well being of a family is important in the development of a child. But I also want to point out that a child helping their parents in an emotional way can put a different perspective on growing up. It can make the family closer and give the child a sense of responsibility (if it isnt too much) that can be good.