It is a personal decision. My sister was diagnosed at 32 and survived 13 years. Unfortunately, I don't know what type of bc she had, and at the moment it is unclear whether my only sibling is enough to access the free genetic testing and I'm not in a position to pay for it. I have 3 kids, including 2 girls so that is a concern. I had a single mastectomy in January and, although I've been told by both surgeon and onc (both of whom I trust) that I will be carefully monitored for a recurrence in the other breast, I still feel deeply uneasy about this and wonder too, if there is a genetic link, would their advice be different. Because I had lobular cancer, I never felt or noticed it but was picked up on a screening mammogram. It was barely visible but turned out to be twice the size they thought and had spread to 3 nodes when it seemed there was no indication of this.