Being nice to everyone is very ethical yet it opens up holes for these exact kinds of people to take advantage of you.
Then let them take advantage of you. I'd rather go to my grave beause I was loving to a stranger who then stabbed me in the back than to live after ignoring the pleas of help from that stranger.
Name a single assumption that I've made, and I'll show you why it's not an assumption.
A. You assume all cancers are detected in only a specific set of ways that you dictated.
B. You assume his mom's checkup was just an ordinary checkup, nothing more. For all we know OP didn't know the exact details of what her checkup constituted and may have been different than what we may all be thinking.
PLANR WOULD YOU PLEASE LOOK AT OFF TOPIC
CAN YOU PLEASE SHOVE YOUR GULLIBLE SICK IN THAT GAY ASS?
Last I saw, Canteloupe was spamming one-word forum topics, but that's not directly relevant to OP's situation with his ill mother.