Breast Cancer

So there have a few new developments in my family on my mom's side. Apparently breast cancer runs in the family. WHO KNEW??? No one. My mom has 4 sisters and her youngest sister was diagnosed just last year in oct got a lump removed and underwent chemo and radiation. As far as I know she is going ok. Now just 2 months ago one of older sisters was diagnosed. AAAGGHHH!!! This time she had lost some weight and started to really get concerned with that lump. She was getting YEARLY mammograms and they still didn't pick it up. The surgeon told her she probably had it for 2 years!!! It was found in the lymph nodes but no word yet as to where else it has been found. She had a total masectomy done on one side and is starting the chemo and radiation as well. There is another sister who has had 6 lumps removed but none cancerous.
So now I've convinced my mom to get genetic testing done to see if she has the marker for it and as soon as I get insurance and it's covered I'm totally getting it done as well.
This totally sucks and almost makes me rethink having another kid. I'm only hoping that in 20 years when I start approaching the age where my Aunts starting getting diagnosed our healthcare system comes up with something to help assist with better diagnosis and screening of this cancer. How is it that mammograms the tried and true test done to find cancer didn't work??? I'm so frustrated and now so worried about getting it and passing it along to Elly!! I totally wish the next kid is a boy now so I don't have to worry about this.
The other thing is that breastfeeding and having kids is suppose to help but both aunts who were diagnosed had 4 kids and breastfed!!! How does that work with the whole breastfeed to prevent breast cancer? I guess it isn't helpful if it runs in the family. I'm just hoping my Aunts don't have anymore cancer and my mom doesn't get diagnosed!!!