I don't know how your kids argue but here is an example of mine.

Cullen yells up the stairs to me in that I am arguing voice and says "Mom, isn't it true that androids don't necessarily have positronic brains?"

I think for a second and then say "Yes, that's true."

He says "See?" in this very meaningful voice and Cam says nothing at all. Can't argue with the truth can you?