Murderer Riddles

The Murderous Family
Riddle:
One evening there was a murder in a house where there lived a married couple with their 2 children - 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 gender. 2. The oldest person and the witness were not of the same gender. 3. The youngest person and the victim were not of the same gender. 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?
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Old Man Murder
Riddle:
An old man, Dave, lives alone in a flat. Because of his age , he is not able to move comfortably and hence most of the things used to be delivered to his house. On Friday while delivering the mail, the postman feels something suspicious in the flat and try to look inside through the key hole and he saw the bloody body of the old man. Homicide arrived the scene. On the outside of flat, they find two bottles of warm milk, Tuesday newspaper, some unopened mails and some gifts. Homicide waste no time and find the murderer almost immediately. How did they do it, and who was the murderer?
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