diagnosis sought

I've been working with a man for the last month whose behavior seems increasingly off the wall. It's taken me a while to start to see the pattern(s) but what I thought was just a large ego with some paranoia seems now to me to be a bit more, more like a real disorder. Perhaps someone here could clue me in on what this fellow is suffering from.

His symptoms:
-excessive paranoia
-excessive blaming of others
-obsessive worrying about everything, with frequent repetition of concerns to me , seemingly unaware that he is repeating himself.
-inability to listen
-inability to have any sort of constructive conversation without it quickly becoming some sort of fault-finding mission
-takes everything extremely personally
-constant "snipping" at people
-passive/aggressive to the max-praising someone one minute, disparaging them the next
-seeks constant affirmation for everything he does
-extremely insecure
-appears to be interested in what people have to say but actually always has his mind made up about any given subject in advance, and seeks ways in conversation to justify or buttress his convictions/plans/opinions rather than have a rational dialogue, inclusive of others

One of his sons is schizo so I'm guessing there must be a link of sorts. Any thoughts?