You know when there are 35+ kids involved, there is going to be tattling.
I think I speak for the crowd when I say that nobody likes to hear, "MOMMY! She (__fill in the blank__)!!!" every few minutes. And if you have a house full of kids who are not taught what to do when "a brother sins" you will be hearing it all. Day. Long.
My children know the scripture in Matthew 18:15 which addresses what to do when you encounter someone doing something they shouldn't.
“If your brother or sister sins, go and point out their fault, just between the two of you. If they listen to you, you have won them over."
These are instructions to Christians for how they should handle sin in the church, but I think it works well in a family, too. Of course, if the sinner cannot be brought to repentance with confrontation, then Mama needs to be told.
Many times, the little, nit-picky things kids tattle about can be taken care of between themselves if they are taught how to resolve it.
You can see more of my ideas on what to do about tattling, and don't forget to check out what the rest of my 4 Moms team has to say about it.