Not wanting to disrupt the magic, I quietly eavesdropped while pretending to ignore them. The conversation went something like this:
Princess: Can I just email my order to you or do I need to do it online?
Smiling Child: Our internet connection is down, you'll have to wait.
P: Do you have any girl clothes in your inventory?
SC: I'll have to check my database. Wait, the internet is up again; you can order online.
This went on and on. Finally the decision was made that the Smiling Child didn't have any girl clothes and wasn't interested in delivering girl clothes anyway, so they just had a war with Lego horses.
Then the middle child went in to practice guitar; the Princess had to accompany him with her chimes and the Smiling Child went in to read.
There's never quiet, but at least the Lego war is over.