Japanese Maths Challenge

Here is the maths puzzle from today, remember the rules:

Find The River

Rules

"Everybody has to cross the river".....The following rules apply:
Only 2 persons on the raft at a time
The father can not stay with any of the daughters without their mother's presence
The mother can not stay with any of the sons without their father's presence
The thief (striped shirt) can not stay with any family member if the Policeman is not there
Only the Adults know how to operate the raft
To start click on the big blue circle on the right.
To move the people click on them. To move the raft click on the pole on the opposite side of the river.