A friend on another site has asked this question and not received any responses. I offered to ask it here for her because I recall this has been brought up previously but I was unable to find it in a search.
"Grown children who blame the surviving parent for the death of the other -- as though the survivor should have been able to do something to prevent the death of the late parent?"
Been there. Just before Thanksgiving. The pain that caused me was incredible and I am so very, very sorry anyone else had to go through that.