cool japanese brain teaser

[youlookalikaman]

http://freeweb.siol.net/danej/riverIQGame.swf

the web site is all in japanese. you have to click on the blue circle and follow the rules below

-the mother can never be in the presence of the sons unless the father is also present
-the father can never be in the presence of the daughters unless the mother is also present
-the criminal can never be in the presence of anyone else without the police officer
-2 people can use the raft at the same time
-the raft can only be operated by the adults

hints:
-mom and dad can be split up
-the criminal can be separated from the police officer