Newly diagnosed

Hi all, my mum had breast cancer at 50 and passed away after 20 year battle. I was diagnosed last week, surgeon appointment tomorrow, surgery booked already. I also had my first grandson last week, same day was having all my mammograms, ultrasound etc. Do I tell her as she is interstate or wait until closer to surgery date. I have my sister & brother supporting me as I live alone.I’ll know more when meet surgeon tomorrow. Dad is in 80s still debating when to tell him. My brother cried. My sister has had cancer, chemo etc so I know we are survivors!