Answer to #196: The girl is 19, the mom 38, and the dad 43.
(Dedicated to BooBooKitty_)

In the middle of winter, a woman is found dead in her bed, with multiple stab wounds in the stomach. Soaked into the sheets is a massive amount of blood, along with blood drops on the carpet. On the side table beside her bed, there is a glass full of water mixed with blood. What was the murder weapon, where is it now, and how was she killed? [Slide for answer]