Two days ago my life changed forever

I'm sorry you have to go through this. Your sister is lucky to have you. I have two sisters. We are very close & I'm happy to have been the one to get bc rather than one of them. In some ways I think your job is the tougher one. One of my sisters was away on a big overseas trip with her family when I got my diagnosis & I waited two weeks to tell her so as not to ruin her 'trip of a lifetime'. Both of my sisters have been amazing, but the one who's really saved me did exactly what Kath suggested. When I felt I had to put on the brave face for everyone else, she was the one who listened & acknowledged & let me fall apart before dragging my sorry butt out to cheer me up. She was here with takeaway, bathing my kids on my worst day after ever cycle of chemo. Mostly, she was just quietly there. My partner (troubled relationship, but that's another story) was the 'stay positive' and 'you're gonna be fine' guy when I lost it, which was completely unhelpful. Sisters have a special bond. As for genetics, I had no family history but I had testing because of my age (39) and multifocal tumor, but still waiting on results. My sisters were told most bc is not genetic & don't stress. If I test positive, which is unlikely, they will take action.