I was reading they're blog. Damn they post a lot of photos! Thy seem to be a really nice family that had the experience and preparation for the voyage. I don't see it foolish at all but looks like a well planned adventure with a family that knew what they were doing.
Hope all ends well. Looks like the situation is under control, the child is doing well with the vessel heading to Cabo. Perhaps after reorganizing the adventure will continue. They seem very dedicated and happy with family cruising life. A great age to do a grand adventure.