Hi @karan2, welcome to Mayo Clinic Connect. You ask very good questions. If dementia runs in the family, is there a test to know if you are at high risk? And equally important, what might be the benefit of drawback of knowing?
Genetic testing can possibly predict if you have familial Alzheimer's disease, but only 2-3% of Alzheimer's cases are familial. Do you know what type of dementia your grandfather and great grandmother had?