Consequently, while Hannah tries her best to keep the family together, she actually causes the family to collapse in such a drastic way because she enables the family's problems to build up to a point where she is unable to hold them back alone, causing all the problems to crash down at once.
Hannah uses her invisibility to covertly defend the family from itself because she is the only one who can see the defective qualities of the household. During an argument between James and Marilyn, “Hannah squirms… Her parents don't notice, In fact, they act as if she isn't even there” (107). Hannah is able to be nearly anywhere in the house without being noticed, and neither movement nor looks of discomfort change that. Hannah uses her invisibility to listen in on things happening