Hi there
I have a 16yo boy and 2 older daughters so was really honest with them - my 16 yo was ok with it once he felt confident I wasn't going to die :-) I found out later that he thought he was supposed to keep it a secret and I was quick to reassure him that he could talk to his mates/ teachers if he needed to ...
I also have 3 grandchildren - the approach with them has been a bit different as we have talked more along the lines of nanny has a sore boob... The little ones are 2 and 3 - they wanted to see and touch my scar from the WE biopsy and they were ok with that...
I think the key is open honest and age appropriate!!!
The conversation with my two daughters also covered self examination and wether we should explore genetic testing - what this means for them and their daughters....
I am sure you will make the right decision for your kids
Good luck xxx
Chris