This might be different for you if you have older kids but, I have little kids so having them travel without me for a few days makes me nervous. Even if my kids are with people I  completely trust, I still hold my breath while they are gone.

When they are gone my instinct is to get in my car and end up at their destination. I am afraid this would ruffle the feathers of the people that they are with. If I show up it might come off like I don't trust the people that took them.  This is not the case, I am just crazy!