I have had genetic counselling for bowel cancer and am at medium-high risk as my Mum has had BC twice and several of her siblings had it.
My OH carries the BRCA gene for cancer. His Mum died of breast cancer, his sister had both breasts removed in her 40s and his niece had breast cancer at just 30 and had her breasts removed too. He was tested and it revealed he carried the gene so could get breast cancer himself or another cancer. He gets tested regularly. My daughter is clear of the gene and son doesnt want to be tested.
My Father in law died of cancer as did my Dad. I have had several operations for skin cancer with another on the horizon. So both our families are full of it but I dont worry about it. Worrying doesnt do you any good.