DCIS and Prostate in family

My mom had BC at age 64, had a mast.; she passed away last year of unrelated issues.  My father had prostate cancer for years, luperon, etc. He passed away last year of unrelated causes.

Now, I was just diagnosed with DCIS - have no idea of my genetic link here -- I have one younger brother, no other living blood relatives. I am 49. Now , I am considering lump. or mast; uni or bilateral. Because of the fact both my parents had a form of cancer, which reading, might be related (BC and Prostate as reproductive cancers) So, my question is.....should I have a genetic test before deciding or just go ahead and be very aggressive, ie. bilateral including healthy breast to prevent against future cancer?  Any help or thoughts around these risk factors? p.s. not feeling especially lucky.  

thanks quinnie. yep, gotta take all into account. I am feeling though that I want to be rid of the risk, thinking I may go the distance on this with a masectomy. I just saw my parents go thru heck, really, it was bad....I have had a revelation about how short life is, even with the best odds.   Also, didnt mention earlier that I already have implants (for augmentation) so more worried about rads and ability to reconstruct at a later date. While my biggest concern is my health, there are so many variables. really,  I am a understated person, but still feel impt. that i can maintain my physical expectations if I can. This is so complicated.