Phew! They are back! Plane landed at 11:00 PM last night. They looked wonderful and had the best experience. (With the exception of their Garmin GPS being boosted in Paris. From a backpack in a locked room. Likely staff. Asshole.)
Now that they are safely back we are SO glad we said YES. I will not lie, we were very anxious but they handled themselves, and any problems that cropped up along the way, beautifully.
I imagine Precious Oldest will sleep quite a bit of the day, but I hope to share stories and pictures soon. And as an added note, thanks for all your good wishes and support. Parenting is a team sport and having my bleeps on my side means the world!