You could always send them home with a copy of this book, and wish them luck:
http://www.amazon.com/Toilet-Trainin...4290396&sr=8-1
I actually used this book on my oldest when he turned 2 (he's 27 now) and it worked like a charm. What can I say - I was a very young mom with absolutely no clue how to potty train
.
If you're lucky, they'll all come back perfectly potty trained and you won't have to stress about it anymore
.