Hereditary Disease- Please inform family members

You're so right!
To be sure! Do it! For some reason (dense folks?), all the red flags in my family history never made anyone sit up and take notice. It was only after my oncologist suggested genetic testing that we found our mutant gene. Since then my siblings have been tested and they, too, are carrying the gene. Some of my cousins carry it, and we are getting set for their children to be tested starting at age 22. It's wierd that so many people in one family had, have or died from the same thing and no one made the connection. I guess our family was just super Duuuhhhh......!