This document discusses parent-child relationships and parental mental health in middle childhood. It examines attachment theory and how secure attachment between caregivers and children leads to better developmental outcomes. Family systems theory views the family as an emotional unit where stress on one member impacts the entire family. The paper also explores the effects of insecure attachment and parental mental illness on children's affective, social, cognitive, and physical development. Secure relationships with both mothers and fathers are linked to more positive outcomes for children in middle childhood.