Why is that funny?

(cross posted, and edited a bit, from Coffee and Chemo)
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On our way home tonight, tired and giddy, my kids and I were laughing about the whole cancer thing. (I know it sounds strange but, trust me, it was funny)

“What is a support group?” asked my youngest daughter.

My eldest daughter jumped in and answered that my support group is “for women with cancer.”

“Not just any old cancer,” I pointed out.

“OK, women with breast cancer,” my eldest corrected herself.

“Not necessarily breast cancer,” I corrected her this time, “women with metastasis.”

“What’s metastasis?” my youngest asked, still confused.

Here, my son jumped in “cancer that is not going away.”

It might sound like a heavy conversation, but it was really quite lighthearted.

I mentioned that, earlier in the day, my sister mercilessly referred to my group as “poor, sick people who sit around talking about cancer.” my eldest, my son, and I burst out laughing.

“Why is that funny?” my youngest asked, even more confused.

“It’s not,” I answered, after a brief pause…. “which is why it is so funny!”

And we burst out laughing some more.