Hi and welcome to HCM. This isn easy to answer. I am afraid i didnt understand the question but as I see you are woried about 80year oold woman and possibilityof cancer development in her relative including you.
Well, affinity to certain cancers(especially breast, ovarian, uterine and colorectal) is associated with genetic predispositions. There is no doubt about it but it shouldnt concern you and make your life insecure.This is still small possibility,it is impossible to calculate it. All you need to do is to look for sign and symptoms more carefuly then the others and do often examinations and preventive tests especially after 40.year. Your doctor will know about these tests. This patient hasserious symtpoms and cancer in history so it definitely needs to be investigted and treted. All you can do is to live healthy, eat healthy food, avoid alcohol and smoking
. You cant change your genetics but can change life habits and think positively. Every human can get cancer no matter about his genetic potential and it is apsurd to be concerned about this possibility because someone in our family has it.
WIsh I ve been helpful.