No one wants to have it, but if one got it, he does not want to lose it. What is It?

One evening there was a murder in the home of a 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?

Solve the following series:
AZ, GT, MN, __, YB

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

My location can be determined by the below rebus.
So where am i ?

I don't get anymore wetter, no matter how much rain falls on me.

Move three sticks of the spiral below to form a square.