My ex boyfriend's dad has cancer.

My ex boyfriends dad has cancer, I'm still in shock. We've been talking more and stuff but what should I do to help him... I've never dealt with this kind of thing before and I really want to try and ease some of the pain although I know it's unlikely ill do so. I'm worried about bringing the topic up. How should I go about it/ what should I do to help him out?
My ex boyfriend's dad has cancer.
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