Tim's kids are now grown, but, while in the thick of hands-on parenting, here's how he dealt with tattling:
We were plagued by siblings' tattling on each other. Someone wise gave us the solution: when one tattled, both got punished (sent to their room or whatever works for you). This ended the practice of one getting back at the other by tattling, followed by a reprisal snitch, etcetera. We made it clear we were going to do it from the start, and we also made it clear it did NOT apply to situations that involved their siblings' safety (playing with a knife or something).
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