I don't know whether you are a trained hypnotherapist, but even if you are, I can only repeat my advice: schizophrenia is a serious mental illness which is best left to a mental health specialist. NLP is not the right tool in this case.
It is wonderful that you want to help him, but you could land up doing more harm than good. You could arouse deep seated fears or dangers of which you are not currently aware.
There is a helpful page here:
http://www.familydoctor.co.nz/catego...atients-guide/
I do not write this in any way to discourage your interest in hypnotherapy and NLP. I have an advanced certificate in hypnotism and a master practitioner certificate in NLP and wish you well in your study of these areas.