Same, runs on my mom's side of the family (yet my little sister and bro still smoke. I could slap them silly sometimes). It definitely isn't a pleasant thing.
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Back to the topic, sorry to hear
@Crazed Liotta Eyes. Wish I had the words to make it seem/feel/be better. As most have mentioned already, just take the time you do have and embrace the moments left and definitely let him know you're there for them. I imagine if I knew I was in my last days I would want some good people around.
Ugh, wish they could nip cancer in the butt.