Girls, found an interesting and fun mystery riddle thought I'd share?

Steph_BT
There was a family of 4, a married couple, and their daughter and son.
One evening there was a murder in their house as one of the family member was stabbed in the back with a knife and brutally killed. One of the family member was the murderer, one was the witness and the other was out for work and not in town.
Below were the things we know for sure:
The witness and the one who was out of town were not of the same sex.
The oldest person and the witness were not of the same sex.
The youngest person and the victim were not of the same sex.
The one who was out of town was older than the victim.
The father was the oldest member of the family.
The murder was not the youngest member of the family.
Then can you tell who is the murderer and who was killed?
Murderer - Mom, Victim stabbed in the back - son
Vote A
Murderer - daughter, Victim stabbed in the back - son
Vote B
Murderer - son, Victim stabbed in the back - mom
Vote C
Murderer - mom, Victim stabbed in the back - father
Vote D
Select age and gender to cast your vote:
GirlGuy
Girls, found an interesting and fun mystery riddle thought I'd share?
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