Have you and your girlfriend sat down and discussed these issues at length? It sounds like you have. My point in my reply to you was that Michael never claimed that he and Terri had a deep discussion about end of life issues. He claimed that she made a remark along the lines of not wanting to be hooked up to a bunch of tubes after a family member's funeral. Do you really believe that those kind of remarks are enough prove that someone would want to die under those conditions? I've told my husband to shoot me if I ever start sounding like my mother. Do you think that a court would take that seriously as a defense in a murder trial?
Regarding "third party second guessers"...would that include her parents?
I would agree that if this is the only time they ever discussed the matter, then yes, this should not be legal grounds to go forward with the removal of the feeding tube. I just find it hard to believe that after many many years of marriage end of life issues were never discussed beyond this.