Hi Gina.
So sorry to hear about your mum,you and your sister must be very worried,I can understand you not telling your mum until you know if its new cancer.
It does not sound good if its hit main organs,try to keep positive there is so much they can do these days,have they tested for this before,because she has been having lung problems for awhile.?
Lets hope there is treatment available,there is so much they can do these days,will be thinking of you and your sister and mum.Love Eve