Well, they didn't. They did ride, and kept riding even when it started raining really hard. And got better. (and faster which comes with confidence) They're both already better riders than half the people I see on the highway every day.
jadecat9 in particular is now really smooth on the take off (no stalling ALL DAY EVER) and is developing a really good tactile relationship with the bike. She's going to be really good at riding, given how good her perception ability is developing.
kilah_hurtz is a lot faster out the door, and more willing to push himself, but is having trouble with left hand/right hand smooth integration - we abused his arm until he could barely use it. I think he's going to learn a lot like me -- pick up bits fast, but need to take time to integrate it.
Afterwards we dried out, drank wine and ate Indian food. A most excellent day, great company and the best send-off for the week I could imagine.