Q. “Menachem: Why haven’t you let his parents know what he has?”
A. In alphabetical order from thesaurus.com.
betrayer
blabbermouth
canary
double-crosser
fink
informant
narc
nark
rat
sneak
snitcher
source
squealer
stoolie
tattler
tattletale
tipster
turncoat
weasel
whistle-blower
deep throat
stool pigeon