I overheard the boys calling each other names last evening before family worship. Viola! The topic for family worship: the image of God in us.
James 3:9-10 says, "With [our tongue] we bless our Lord and Father, and with it we curse men, who have been made in the likeness of God; 10 from the same mouth come both blessing and cursing. My brethren, these things ought not to be this way."
I explained that God made Allan in His image, so when Daniel calls Allan names, he is actually calling God's image names.
It's like having a picture of Mommy in your hand. After you tell Mommy you love her and give her a kiss, then you take the picture and say all kinds of nasty things to it. Or you tear it up in little pieces.
How does that show that you love Mommy? It doesn't, right.
Daniel is a picture of God too. If Allan calls Daniel names, then he is calling God's image names.
I'm not sure it stuck, but it's line upon line. That's the first line, I'm sure there will be plenty of "along the way" opportunities to repeat it.