Is the smith sisters deathchain true?

[Carlos]

This story is fake look it up on it is impossible the sister can carve her name onto the floor and not use whatever as a weapon how did she not see the guy kill the sister if she walked to the window instant messaging wasn't invented in 1993 and how come the sister did not wake up by the noise and why would the sister carve her name as she was hiding it is not logical and why would the killer put their bodies in the closet instead of hide the evidence