Because I'm the Oldest

So we're driving to REI (20% off! I got boots, finally.). Iain's in the backseat.

[I chat with Mother]

Iain: "Can you be quiet? I need to make an important phone call."

[We giggle.]

Iain [into the phone]: "Hello? Are you there? Hello?"

Me: "IAIN! HEY PAY ATTENTION TO ME! DON'T MAKE THAT CALL, TALK TO ME PLAY WITH ME MEMEMEMEME!!!"

-pause-

Iain: "Mommy, I'm making an important call."

Me: "Yes, and you never let us make calls undisturbed. Why should I let you do so?"

Iain: "Because. I'm the oldest."

Oh.