I got this from a kendo forum. Enjoy. It is very very frustrating.
There are a few rules which you need to know in case you can't read Chinese...
1. Everyone needs to cross the river
2. Only 2 people on the raft at any one time
3. The Father cannot stay with the Daughters without the Mother's presence
4. The Mother cannot stay with the Sons without the Father's presence
5. The Criminal (striped Black & White Top) cannot stay with a family member without the policeman there
6. Only Father, Mother and the Policeman know how to operate the raft.
Click on the person to put them on the raft.
To move the raft, click on the pole on the opposite side of the river.
To start, click on the big blue circle on the right hand side of the entry screen.
The Answer is in the comments!