@SamJgS I found genetic counselling to be interesting. I spoke to a geneticist at Peter MacCallum who had all my sister's tests in front of her. They were only done three years ago and as no new tests had been developed since then, they didn't worry about testing me. We had a long chat and she sent me some very clear and informative information. It included advice for my remaining sister, and my daughter and niece. Thorough!
Bowel cancer in my family too ☹ When this is over I'll have to get a colonoscopy...