My sons' father has pancreatic cancer

I am in need of some advice on how to best support my two adult sons, 18 and 19, with their father's cancer diagnosis. From what I have been told, it is one of the most aggressive types of cancer and the survival rates are low (please correct me if I am wrong). I have no experience in dealing with this situation as I have never experienced anyone close to me being diagnosed with cancer. As their mother I am of course worried about them and want to help them as best I can. Their father and I are not together and haven't been for 16 years. They still split their time between both our places.