Glenn Ross, a 55-year-old man, was diagnosed with inoperable pancreatic cancer. His prognosis was poor; he was given about six months to live. He underwent several series of chemotherapy treatments, but they were of no benefit. He continued to lose weight, suffer from nausea, and become weaker. After three months of chemotherapy treatments, he stated that he wanted no further treatment. He became bedridden and was admitted into a nursing home for terminal care. Glenn's son, who lived in another state, arrived at the nursing home and demanded that his father's physician be called immediately. The son wanted his father to be hospitalized and placed on chemotherapy immediately. When the physician explained that there was little hope for the father's recovery, the son threatened to sue the physician for withdrawal of care.

Given this situation (problem), what should be done?