Losing family members to Alzheimer's

Early this week, our family lost Uncle Dean...  my Mom's brother.  And about 6 months ago (winter time), we lost Mom's other brother - Uncle Dick.  I didn't write about it then, probably because I was overwhelmed and honestly we weren't that close to that Uncle.  (bad, I know).  But regardless...  when you step back and think about all of this...  my Mom was 1 of 5; and there are only 2 siblings left...  the 3 dying from Alzheimer's, along with their Dad (my Grandpa) died of that awful disease.  How can that make anyone feel safe or think we won't have that terrible disease?  It honestly makes me sick to my stomach.  So scary.