My father is talking irrelevantly after being admitted to the ICU. What can be done?

Hello doctor,

My father had a chronic liver problem. Last week, he began to puke blood. At once, he was admitted to an ICU of a private hospital. The endoscopy was done, and the doctor prescribed him medicines for binding the areas in the food pipe where the bleeding occurred. That was done. The blood puke stopped. The next day he was shifted to the general ward. Then, his tummy began to grow. The doctor said that water is accumulated in the bowel because his liver is not working properly. He looked fine, and we had a long conversation. The next day, he had a breathing problem and was again shifted to the ICU. The doctor said that he had pneumonia in one of his lungs. He has prescribed an antibiotic which I accepted. Now, he has red patches on the skin of his lower abdomen and legs that look like burns. He is not talking properly, and moreover, he is talking irrelevantly. The doctor said that his situation was critical. What has happened? Can he be cured? What can I do?