Also called Japanese IQ Test.
Very similar to the Fox, Rabbit, and Cabbage puzzle from Fargo (tv 2014)
The rules:
1. Only 2 people on the raft at a time.
2. The Father cannot stay with any of the daughters, without their Mother's presence.
3. The Mother cannot stay with any of the sons, without their Father's presence
4. The thief cannot stay with any family member, if the Policeman is not there.
5. Only the Father, the Mother and the Policeman know how to operate the raft.
Please don't post answers in the comments.
