If it's schizophrenia you could try getting them on niacin and b complex.
If you google niacin, abram hoffer, and schizophrenia you'll see a lot of supporting evidence.
There's also a book, "Healing Schizophrenia: complementary vitamin & drug treatments," by Dr. Abram Hoffer.
Before I started using niacin, I was deranged, and stupidly religious. I believed a lot of dumb things. Some schizophrenics dwell on aliens, some religion, others government plots. None being able to tell the difference between what's real and what's not.
I was Jesus crazy before niacin. After I started niacin, I forgot about religion and became athiest.
I took a short vocational program at a university and got a higher paying job (in health care).
Soon I'll take a slightly longer vocational program and have an even higher paying job (also in health care).
Before niacin there wasn't much hope for me.
RPD makes the niacin work even better.