Could Father have frontal temporal dementia?

Start with your dad's family Dr. A diagnosis of dementia doesn't happen in one visit. Your dad needs to be evaluated and tested and scanned. His Dr. may refer your dad to other Dr.'s. It's a process. But since your dad's personality had changed I'd start with taking him to his Dr. first.

If this personality change has been sudden, have your Dad checked for an urinary tract infection [UTI] which in elders can cause unkind, mean, hurtful behavior.

For some really informative articles regarding dementia, scroll down to the bottom of this page to the blue section... click on ALZHEIMER'S CARE... and scroll down the list of articles.