Isn't paranoia a sign of dementia? My dad has been seen by his primary doctor and a psychologist and all said he was fine even after we pointed out the problems. Yet my dad still continues to show severe paranoia toward his daughter and her family. Any advise as what to do?
But to answer your question, yes, paranoia can be a symptom of Alzheimer's but dementia and Alzheimer's are different which is why an evaluation is always a good idea except it sounds like your dad has already been evaluated and given a clean bill of health. You may have to wait until the symptoms become more prevalent as they most certainly will if he has Alzheimer's.
Is the paranoia new behavior or has your dad always been a little paranoid? What is his paranoia about specifically? If you could elaborate a little there's usually someone that comes along who has experienced the same thing (that's the beauty of this site).
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Once you understand the stages and symptoms it is possible that you and your family may be able to recognize other symptoms that you have overlooked. In the earlier stages of dementia, it is possible that the patient may not be diagnosed. However, the earlier the diagnosis the sooner the patient can be put on medications that may help slow the progression of the disease. If diagnosis is made at a later stage, the medications may no longer help.
Document the changes you have seen in your father and give this to his doctor before the next visit. Doctor's typically do a battery of tests to determine if dementia is present or not. Here's what they do:
http://www.alz.org/alzheimers_disease_steps_to_diagnosis.asp