What are symptoms of minor schizophrenia?

My son has been diagnosed with ADHD and BiPolar...I really feel @ age 20 there is still something that hasn't been touched on. In discussing it casually with others schizophrenia keeps coming up...and then I heard his "sperm donor" was diagnosed with minor schizophrenia in a pysch evaluation in jail (please no negative comments on the connection on my choice of boyfriend, it was a teenage pregnancy, he has not been around since my son was 2 and I SERIOUSLY learn from my mistakes, remain focus on the importance of my question). We are making the transfer from his adolescent Psych. Dr to an adult care Dr and I want to make sure I pick the right one with the right specialty and know what to look for to give him the best help for his future. He is not violent by any means...very soft hearted but hard shell and stories of delusion that are OBVIOUSLY not true, as if he doesn't realize he grew up with me and I would have been there during these elaborate situations of tales...but very emotional if you show any doubt of believe. He does his best to remain social, and has a select few "understanding" friends...but his maturity level is at least 6 years behind..He always starts off a job excited and hard working, and without fail is good for about a year...then slowly but surely calls in to much, comes in late to much, or asks for to many days off, and always ends up fired. He is very giving and hands over all his money and asks me to manage his bills (cell phone and one credit card when he attempted to go to community college and paid for books) and although he does not spend money and is good with saving...he is generous...to generous, will gladly pay for dinner for all his friends, using his ATM card for $80 after I have explained he only had $60 left. Is GREAT with young kids, animals, and in school was always fighting for the underdog and volunteered on his own time and used all his electives to TA with the Special Ed. However, he will talk A LOT of stories about guys talking s%#t and him having to beat their a$$...worries me, but yet no one has ever witnessed this, but he talks anger a lot. He can live with me forever as far as I'm concern, but I can't live forever...then what????