Children's friendships, and peer relationships in general, do not exist in isolation or suddenly appear, but rather originate in and are built on the child's earlier relationships within the family. Children's relationships with the primary caregiver and the rest of the immediate family provide an experiential foundation and set the tone and expectations children hold for their future peer relationships. Research by Alan Sroufe and his co-workers has shown that infants with a secure attachment to their caregivers do subsequently...