Well, he made it out of the second surgery and was doing OK, but apparently started bleeding and had to go back in for surgery - at least, that's what we think happened. My grandmother (my brother's mother by adoption) got a call "a while ago" that they were considering taking him back in to surgery because he was bleeding; and apparently she called my mother (my brother's biological mother) and said "he's bleeding and they're taking him back in to surgery." There's a lot of family drama built in to the situation, so what's really happening I won't know until my mom finds something out from the hospital (which she just got back to) and calls my dad, who will call me.
Edit: OK, got a call from my mom, who is calmer... his blood pressure spiked to 270 (over what I don't know), and then started going back down. They don't know if he's had a stroke, or what's causing the blood pressure spikes, but his pupils are reactive and the doppler scans on the skin and blood vessel grafts they did on his cheek are still good, so blood is still flowing. They are worried that if he keeps spiking blood pressure like this it'll blow the vessels in the graft and kill it and they'll have to take him back in. For now, they're going to start an EEG and some CAT scans to see what's going on. Also, I'm probably not going to sleep tonight.
Edit 2: Well, he made it through the night, and he's in stable condition; but they had to put him in a medically induced coma and then had to medically paralyze him twice - first his whole body and then specifically his head/mouth - because he was grinding his teeth so much that they were worried he might rip out his sutures and the inside of the cheek graft. They're waking him up today, so we'll see what happens.