telling my family

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I was just diagnosed with MBC.  My original cancer diagnosis was 2009.  I do not want to tell my family (siblings, mother).  My mother turns 88 today and I cant break her heart.  She lives about 100 miles away and I see her about every 2 months.  I am definitely waiting until all of my tests results come back and I meet with the doctor for treatment options.   Im already dreading my kids going through this again. Please give me advice on how long I should wait to tell her.  I think this may kill her.Cry