Nice to hear that you are doing well and recovering from your surgery. Of course, the immediate thing that jumps out to me is that his reaction to your situation was made all about him, and how no one told him. Still mind boggling, that as an adult, he still seems to believe everyone is responsible for keeping him briefed and informed, while making no efforts , as you say, to pay attention to someone other than himself.
Also, just as mind boggling, that he seems to outright refuse to make things right with your S out of sheer stubbornness, even so far as to risk permanent severance of their R. The things these people choose to do are still so inconceivable to me. I hope he is smart enough to make amends before your S and DIL make their move, but that's his choice, in the end.