What are Kate's responsibilities in 'All my sons' ?

Though she has a successful husband and a loving son, Mother cannot abandon the memory of her other son, who was lost in the war. Her delusions about Larry's disappearance and her vehement self-denial are symptomatic of greater issues than just a grief-stricken mother's inability to cope with the loss of a child. Nervous and suspicious, Mother has taken on the burden of her husband's secret while he presents the face of an untroubled conscience to the world, while she suffers from headaches and nightmares. Her fantasies about Larry are constructed from a sense of self-preservation, and the flimsy basis for her hopes is threatened any time someone who loved Larry intimates that he or she may not share Kate's confidence in his return.