This can certainly be a difficult for many family members to discuss and many refuse to do so but that can actually make the whole process much more painful than it needs to be.
I have discussed what I want with my sister (When she should pull the plug, what to do with my stuff, how to look after my finances if I am incapacitated, and so forth) and she took me to see a lawyer a couple of years ago. I told him what I wanted and he sent me an email of a living will and POA for me to read over, but I had a couple of questions before I signed them, so emailed him back but I never heard from him again. I could not even get to make another appointment with him. Don't know what happened there......
I had been thinking about this very thing somewhat lately so I realize I need to find another lawyer and get it done for sure this time...... It is all very straightforward, but It should be in writting and legal.....