What do you think about me telling my sister that her beating breast cancer was neither impressive nor inspirational.
Why would you even think of talking to her like that?
Because it's really no big deal.
You don't sound very sympathetic towards your sister. Surviving cancer is a very big deal, and you shouldn't tell your family members that beating it is not impressive.
Why are you being such a nitpicker?
I don't understand why you'd want to be negative about her recovery after all she's been through. You should be supportive and happy that she's well.