Final answer:
Doug is experiencing Kübler-Ross's stage of acceptance.
Step-by-step explanation:
Maxine's father Doug, who is in his last days of life, is experiencing Kübler-Ross's stage of acceptance. According to Kübler-Ross's model of grief, acceptance is the final stage where a person adjusts to the idea of death and reaches a sense of peace. At this point, the person can face death honestly and regard it as a natural and inevitable part of life.