Fun game

This game (the title is a link, as with most of my entries) is a lot of fun. It is a puzzle so theoretically once should be enough but for some reason I often for get the "secret". So the rules are:
1. Get everyone across the river (click on them to add them to the boat)
2. The mom can never be with the boys unless dad is there.
3. The dad can never be with the girls unless mom is there.
4. The prisoner can not be with any family member unless the guard is there.
5. Only the mom, dad and guard know how to drive the boat.
6. Only two people can fit on the boat.

Have fun!
G