I've got two DD, 7 and 12.
What does everyone do when their kids bicker? You know the sort of thing, "You're an idiot" "No, you're an idiot!!"
Sometimes I leave mine to it, see what happens and if it resolves itself although normally I am dragged into it...."Mummy!!! She said/did XYZ"
Just wondering what others do really, I always try and be fair to resolve it, sometimes threaten to bang their heads together 🤣