Well rod, we do the same sort of thing with our 2 kids. I sugjest letting your little girl go without, If your 12 year old has a problem wiht it then he or she should be able to figure out a way not to wet on long trips.

i saw this suggested at a few places, so last week i told my kids (boys 9, 12, 14) that they were going to wear goodnites, they fussed at first but it worked well.

My 15 yo girl and 12 yo boy both wear them, highly suggested, goodnites are very private too.