My experience was with my mom. She developed cancer and got the whole shooting match of surgery, radiation and Chemo. She then had basically a 5 year remission. At the end of that it came back with a vengeance over the course of another 3 years. Due to the aggressiveness it was showing, they put her on one of the most powerful chemos (carboplatinum) that they can use. That only caused her to develop “chemo brain”, a form of dementia but I think it actually caused a stroke. She was never the same again and did not even recognize my Dad. The disease kept progressing to the point that the cancer had spread to her spine, pelvis and lungs. She ended up in the hospital and they asked myself and my Dad what did we want to do. There is no cure and she was clearly dying but it was dragging itself out and causing her excruciating pain. We then got asked if we would like to do palliative care for her. the palliative doc at the hospital explained what it meant. It is euthanasia. At a certain point, they would make the case to the corporate legal counsel, who would then either green or red light the actual act. We received a phone call around midnight and they said you should come to the hospital. When we got there, she was alone in a two-bed room, unconscious. They said she had just had a morphine shot. After about an hour or so, they called corporate legal to confirm their decision. At 2 am, they came in and gave her another shot, before which, they said to say our goodbyes. I kissed her on the forehead and said I love you, Ma. I then watched for a few minutes and she stopped breathing.
I’ve had a similar experience with a close relative. You have encapsulated the situation well.