"Dar!"

That's what Clem and I call each other. And that what Cavan calls us now.

Cavan started out by calling Clem "dare dare" and me, well, anything. He started observing how Clem and I interacted and watched how I would yell "Dar!" from the room and Clem would answer from somewhere else in the house. So whenever I yelled "Dar!", he would look out of the room expectantly and looked back at me after Clem's reply.

About 2 months into the observation, he started calling us "Dar!"

My parents and in-laws were certainly amused by this reference.