A recent NPR segment (http://www.npr.org/sections/health-shots/2015/09/25/443444964/parents-can-learn-how-to-prevent-anxiety-in-their-children?sc=tw) cited a study of 136 families where anxiety was a problem. Each family had at least one parent with an anxiety disorder. About one-half of the families received 8 weekly sessions of family therapy. The other half were provided with a 30-page handout about anxiety disorders.
After one year, only 5% of the children where family therapy had been incorporated developed an anxiety disorder. Among the families that had only been given the handout, the number of children who ended up with anxiety problems jumped to 31%!