I think almost anything is possible.
Arguments for: It makes a LOT of sense. He was stable in the hospital. His family acted strangely in the video. (because they knew he was alive?) ... more
Arguments against: DC is run by derps and derps showed up in the hospital immediately. Derps wanted him dead. His family acted strangely in the video (because they were threatened or because the brother was guilty?) ... more
So which is more plausible?
I agree it all makes sense why Seths brother and family acted the way they did. Why they refused to release the laptop. If the brother was also involved he was and is also in danger.
SS1
Probably dead but with the typical derp state coverup where things don’t quite make sense but you can’t pin anything on them, who knows?