A family may "fall ill" because in the course of its life history it is exposed to shocks and stresses. Countless factors can affect the functioning of the family system: A child is born, matures, starts school, leaves home; relations sour between husband and wife; there is an accident.
家庭之所以會生病，也是因為每個家庭在生命歷程之中，都隨時會遭遇各種變遷與壓力，例如孩子的誕生、成長、就學、離家、夫妻情感發生變化、意外事故發生、甚至外在環境如政治、社會的轉變等等，都可能會影響這個系統的運作。