In some hospitals in US, UK and France- if your close family says no, that usually overrides your request(not every time but often). Either that or the family try to sue the hospital. They say because their loved one was alone with no advisers-they were talked into it by those trying to free up beds. I know this is not true. Moreover, the families say their loved one was depressed and so did not have their full reasoning powers.
The only way around this is to tell your family and make sure they agree. It’s difficult but not impossible.
My younger sister worked as a senior nurse in all three countries above over a 20 year period. She also worked in Germany but I don’t know what their situation is.