Hallucinations are false perception of something they see, hear or feel that cannot be corrected by someone telling them it is not real. Causes of hallucinations can be:
• Medications
• Physical problems, such as dehydration and kidney or bladder infections
• Schizophrenia
• Alcohol or drug abuse
Delusions are a fixed false belief not supported by reality. Delusions often result from memory problems.
Paranoia is a centered around suspiciousness (e.g. deriving from schizophrenia)
In order for that delusion, hallucinations or paranoia to render a person incapable of making a will, it must influence the testator in the making of the will. In other words, the delusion must relate to the assets disposed by the will and the persons receiving a benefit under the will.