If you are dealing with someone who is experiencing mental illness, he needs to get help. I just pulled my DSM (clinical diagnosis manual) off the shelf b/c schizophrenia is so incredibly rare that I needed to refresh myself on the criteria:
- delusions
- hallucinations
- disorganized speech (incoherence)
- grossly disorganized or catatonic behavior
- "negative symptoms" i.e. flattened affect, minimized movement, etc.
What makes me suspect that there is something else going on here is the age factor. Schizophrenia typically starts manifesting immediately after puberty and is most often initially diagnosed as "Bipolar". Typically during early adulthood, the delusions and hallucinations become overpowering to the point of loss of occupation (school, work, relationships) at which time most differential diagnoses then reflect "Schizophrenia".
More likely, your uncle is experiencing the onset of a psychotic disorder as a symptom of the onset of dementia or another underlying condition.
You describe symptoms often associated with a schizophrenic patient, but more accurately you are describing psychosis that probably has a different source. Either way, get him to both a psychiatrist and a neurologist immediately b/c he needs meds.