A higher well-being later in life can be influenced by factors other than the attachment with the mother. A child with a secure-attachment tends to have higher well-being in later life. This may be due to other factors related to the attachment with their mother. A middle-class family environment often allows the mother to have more time to spend with the child and therefore establish a secure attachment with the child. This may not be the case if the child grows in a low-class family as the parent will be struggling with debts and work trying to make ends meet without enough time to spend creating a secure attachment with the child. Although secure attachment seem to lead to better well being later in life other factors related to that attachment could be influencing the outcome of better well-being.
I agree with what you're saying here. The environment for a family seems as though it would play a very important role on the development of a child in that family. Also, depending on the class of the family, the child's parents can be more or less active in early life; however, like you say, this will be somewhat consistent with the child's well-being in later life because of the nature of a class system.
