He's currently under investigation for Autism - he has developmental delay, can't talk, doesn't engage socially except to demand his needs are met (his language involves commands and repeating words without context or understanding), has severe behavioural problems, his play ability is severely limited (expresses no use of creativity, imagination, lines stuff up all the time etc), social and emotional developmental delay....he's a bit of a mixture of things which strongly indicate autism but could be other things too.
If we're out and about, he doesn't listen to instructions, is unresponsive or aggressive to being asked to do things and can be a danger to himself and others in public if he flips out. His emotional triggers are unpredictable and his ability to cause harm is quite substantial - but he has no recollection of it ever happening afterwards, as far as anyone can tell. A bit like a red mist, you know?