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Who Did It: Murder in A Family of 4

One evening there was a murder in the home of married couple, their son and daughter. One of these four people murdered one of the others. One of the members of the family witnessed the crime.The other one helped the murderer.

These are the things we know for sure:

1. The witness and the one who helped the murderer were not of the same sex.

2. The oldest person and the witness were not of the same sex.

3. The youngest person and the victim were not of the same sex.

4. The one who helped the murderer was older than the victim.

5. The father was the oldest member of the family.

6. The murderer was not the youngest member of the family.

Who was the murderer?


Be Detective To Find Who Did It: Murder in A Family of 4!
   
Find out the murderer here!

Source 

Roles of Family Members


What was the case?

From (6), we know the youngest one wasn't the murderer. Clue (3) suggests youngest wasn't the victim & (4) hints that youngest wasn't helper too. Hence, youngest must be witness.

So possibilities of others' role are listed in table below.


 Logic To Know Roles of Family Members in murder case

From (2), the witness had opposite sex than the oldest & from (5), we know father is the oldest. So witness must be daughter.

Logic To Know Roles of Family Members in murder case

From (4), murderer was older than victim & since father is oldest he can't be victim. So last 2 possibilities are eliminated.
Logic To Know Roles of Family Members in murder case

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