Is the smith sisters murder really real? Because I've seen the answer "yes", and I've seen the answer "no".

I haven't seen anything about it, but I'll keep looking. But is it real? You know the email that is going around about the two sisters that get murdered in the younger sister's room, and 15 yrs later, the older sister somehow IMs the brother that was born 3 yrs after the murder, and the older sister kills the parents the same way that the older sister was murdered. I'm confused. How do you tell if it is real or not?