I really recommend the book "Being Mortal" by Atul Gawande. It helped me process the drawn out and unpleasant death of my grandfather and look at end of life care in a different light. There's an important difference between extending life and providing quality of life that a lot of patients and doctors both misunderstand.

The book is written from the author's own experience as a doctor but also includes his experience with his own father's death from cancer.