the gist of this article is eerily implying that dementia exists sometimes from a young age and is rarely ever treated effectively or cured . in fact for over 80 years the terms dementia and schitzo were interchangeable . my mother certainly suffered from bipolar all her life and in late stage dementia a schitzo disorder reared up complete with paranoid delusions and hallucinations .
so if you wonder if your demented elder has always been nuts , id say probably ..
relax and enjoy the ride -- its largely hereditary..