@magalinebell1958 I know how upsetting it is to have doctors tell you that you need to have surgery on your breast. Try not to Judge the plan yet, I would look to get a second opinion if possible before anything was done.
Cancer isn’t always hereditary, in fact many aren’t, most of my friends that have gotten cancer, did not have a family history. I am glad you are getting the MRI, as this can further diagnose or dispute diagnosis for you.
Since DCIS is a pre-cancer condition you have time to make he best decisions for yourself.
Are you comfortable with the doctor you have? Do you live in an area with access to a larger teaching hospital, or cancer center for a second opinion?