My father was diagnosed with Demethia three years ago. We do not know if anyone else in either family had it. As far as we know, no one else has. I am really concerned about having inherited this dreaded disease. Should I be tested? I get scared everytime I go to do something and my thought or action leave my head as quickly as it comes. I am having a really hard time with this. It is like forgetting the little things. Sometimes it comes back to me and sometimes it doesnt. Should I be concerned? I have one sister and one brother. Thank you for your anticipated responses.