The second sentence reads "Research by the Australian Institute of Family Studies (AIFS) shows roughly double the rate of depression and anxiety, among young adults who also report an abusive or unsupportive upbringing". Abusive or unsupportive upbringing ≠ dysfunctional family.
I never said that self help books are fringe theories. I said that the idea of there being  six basic roles is a fringe theory. And I think it's quite obvious from the title that "Forgiving Our Parents: For Adult Children from Dysfunctional Families" is a self help book. 79.97.92.28