Both of my parents have had cancer, but neither were the rare types seemingly caused by CHS (melanoma and kidney cancer). Certainly worth keeping an eye on, though.
I'm sorry to hear that and hope that your parents and you're healthy from here on out. I do wonder if the incidence of cancer in your area could be compared to a similar community in a sort of natural experiment to see if people in your home town were more likely to contract cancer than the other community.