Thanks for all the comments, and thanks for putting up with me writing this stuff, it does help deal with it.
Just got back from visiting him. He’s in a sort of half-coma: he actually squeezed my hand at one point, and he sort of half-opens his eyes, and half rolls them back in his head. He also seems aware of the intubation tube on occasion, and yawns sometimes.
Tonight there was a very helpful nurse on who I hadn’t met before. I asked him about my son’s current GCS score, but I probably should not have done so. I also asked him where the original words about “catastrophic” came from. It seems that the consultant – with many years of experience – has only seen a handful of cases as bad as this. A lot of badness showed up on the CT scan (he had a long word for the badness but I’ve forgotten what it was).
It’s just as well this forum has a swear filter.
MRI tomorrow, should give us more information.
My wife just sat with her head in her hands while I was asking about this.