This got me too, but on reading, it's clear the author means parents of young children. Since the focus of the article is on child development, it's reasonable

This got me too, but on reading, it's clear the author means parents of young children. Since the focus of the article is on child development, it's reasonable that it limits its scope to parents of young children, and not e.g. parents of 50-year olds, even if building trust might be nice there too.