Great news @Cyclo. My family are the same and our tree is mapped. If new genes found they will retest samples of those past and present to see if they can find an inherited cause. 2 sisters in 6 and a niece of same sister...random or not it is a concern. Both my niece and I have had bilateral mastectomies. What I know is breast density seems higher in our family and my other sisters all counselled about mammograms etc. I also was ecstatic to find I hadn't inherited my Father's family brac1 gene mutation (very high incidence of ovarian cancer in my Aunts)...and neither did siblings...this we celebrated.