It is my experience that having it in writing doesn’t really mean much. The doctors seek consensus even in the face of living wills, sign sealed and notarized. It is all done nicely to get the lay of the land and then possibly disrupted in spite of the consensus and living will.
I don’t mean to over emphasize the point but the hall way at the ICU is not a court room. That doesn’t mean the living will will not prevail if pressed however.
A living will is not enough....it is why they have a health care power of attorney. That or a POLST are what you need.
Families can be a very messy thing when end of life is at hand.