Here are the 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 Father, the Mother and the Policeman know how to operate the
raft.

To start click on the big blue circle on the right.

LINK

Lets see if you guys can figure this out.