Those who know my children personally know that Son #1 is cautious and thoughtful, and Son #2 is impulsive and and fearless. So, the following conversation seems especially intuitive.
Son #1: Mommy, I'm going on a trip to Mexico.
Me: Ooh... mommy wants to come!
Son #1: No, you can't come. It's a kids trip!
Me: Will you be taking your brother along?
Son #1: No- he can't come either. He's just going to run around all over Mexico and cause problems.