SMARTNESS Test: Are you Samrt?

Are your SMART? Take this Challenge
Only 10% people can solve this in less than 10 minutes.
One a river bank three are following people:
1) Father and his Two sons
2) Mother and her Two daughters
3). Policeman and Thief

Your Challenge is to help them to cross the river, under following conditions:
1. There is only one boat which can accommodate one driver and one other
person only at a time.
2. Only Father, Mother and Policeman can row the boat to other side
3. Thief will beat the family member if police man is not there.
4. Father will beat the daughters if mother is not there
5. Mother will beat sons if father is not there
6. Thief will not run away even if left alone on either of the bank.
7. These people can go and come back, as many time as possible.
This is also a good brain exercise, which will help you to sharpen your mind and increase your concentration.
If you are able to solve it, please mention the time taken by you to solve it.
I will post the answer shortly on: Nimit Matr Experiential Trainings
Nirbay: Face the Fear, Finish the Fear
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