Thank you for your reply. The more I thought about it last night, the more I wondered if she did in fact know something but wanted to tell my mum before she told me, and I was right.
Found out this morning it is acute myeloblastic leukemia. I don't know anything more specific - perhaps the second biopsy is to find that out. Apparantly it is one of the more treatable forms?
My poor gran. Don't want her to have to go through awful treatment, and don't know what my grandad would do without her.
I hope your dad works out ok and that the medication is effective. It's so scary.