Tattling

We have been trying to work with Nathanial on NOT tattling.  We have been trying to teach when it is okay to tell on his brother and when it is NOT okay.  I would say that 99% of the time that Nathanial tells on Christopher it is not okay.  Tonight the boys were in the bathroom brushing their teeth when Nathanial comes out and says to me, "Mommy you need to come and see this because I don't want to tattle." Ryan and I just started to laugh.