If it was me Sally I'd want to know the genetic details. But this is an intensely personal decision.
My sister was the second person in my family diagnosed with breast cancer, after my mother. She had the genetic testing done; I know she was influenced in this decision by the two females in the next generation, her daughter and mine. No new tests had been developed between her death (from BC) and my diagnosis. I had a long chat with a geneticist at the Peter MacCallum Familial Family Centre who later sent me a report. The girls are advised to commence surveillance at 30.
The BRAC1 & 2 genes are the most common genetic link to BC discovered so far. Of everyone who develops BC, 3% have these genes.
There may be insurance ramifications if you have genetic testing done. You can always go and have counselling with them before you do or don't get tested.
Don't feel pressured, do your research, listen to your gut. Make the decision you can live with. K xox