Deanne-
I found when I wrote complaint letters (and I wrote quite a few) they were received better if I also mentioned the people who provided exceptional care. That way, no one thinks you are just another whining, complaining, person.
I put the nice comments first and then let them all have it at the end.
One letter which received very positive reviews (from medical personnel who came to me on the QT) asked that everyone who was reading this letter would imagine how they would feel if their son, daughter, mother, father, sister or brother, wife or husband were treated this way and brought to critical condition due to inept or neglectful medical care. I would certainly mention the comments that the neph said about having to get going because he needed to go to his son's football game. That comment said it all for me. It was all about him, and he wasn't even sensitive enough to realize the impact on you and your son as Brian was struggling for his life hooked up to all kinds of machinery to try to save his life. Brian would surely rather go to a football game too.
Stay tough as long as Brian is still in the hospital. His care there still has to be watched like a hawk.