So can I worry? And not feel silly for worrying?

My grandpa is recovering well. He's staying home and staying as busy as one can in a house... I think that he still goes outside to "help" the farm hands (i.e. stand there watch and give direction). He starts radiation on Friday. He'll go everyday for 6 weeks or something like that. It will be pretty intense, but I think that he'll do well. He's strong and maybe a little stubborn, not that that trait would run in the family. Hee hee. So he's ok, that's what I'm told.

I have another relative that I am more worried about, but she won't let me in to know whether or not she is worried. She went in for her routine boob squeeze (that I had to talk her into, she hasn't been for a couple of years and is over 50, and supposed to go every year). They called her back for another one. Not because she breathed wrong or anything. She saw the pictures and has what the doctor called "calcifications." She has to go in for a biopsy sometime soon. They didn't tell her whether or not it could really be cancer cells or just "calcifications." I don't know whether or not to be worried about her or to just sit back. It's my mom. What would you do?