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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.

My wife speaks Chinese. That helped :)
There are whole books of these kind of puzzles, some dating back 1000 years.
Do you know any titles?
I googled 'puzzle chicken fox grain' which is the well-known example but I got only websites but no books. Sigh. One day we'll have a search engine that you can tell what you want instead of whispering keywords into the dark.
To start, you must touch the big round blue button. I can't understand the instructions, but after playing for a while, I can guess them. But still I can't win.
For anyone wondering, there is indeed a solution to this puzzle. Be persistent!