The following estimates were adapted from a number of studies in different areas, times, and definitions. The true risk may be higher or lower than the range as quoted, but the general pattern should hold, in that the risk declines as blood relationship becomes more distant. An exact explanation of schizophrenia evades researchers, but symptoms are well documented. Some lead functioning lives, while others need greater help to cope with the burden of symptoms. It's worth noting that the disease is widely misunderstood often confused with multiple personality disorder, and still carries a social stigma.
Treatment usually entails both medication and supportive counselling.
We are in the midst of an explosion in knowledge in the neurosciences, and research into mental illness is at an all time high, which bodes well for future treatment regimes. As well, early diagnosis and stabilization and modern treatment greatly improve prognosis for the illness. They can watch for warning signs and respond appropriately to the symptoms, should they occur, earlier rather than later.