@Afraser and @LucyE I was following links from another recommended article and came across the breast cancer risk calculator. I had a play around with it (pretending I hadn't been diagnosed) and the one thing that brought me out of the moderate risk to high risk was my sister having had BC (she's the only one in my family who has ever had it). I was really surprised about that. Interestingly, it doesn't ask how many siblings you have and how many have had BC - it appears to be that 1 is enough. I know it's a very simple tool but was still interesting to do.