13-year-old stabs 2-year-old sister

13-Year-Old Fatally Stabs 2-Year-Old Sister [VIDEO]
This has got to be one of the most disturbing stories of a family dealing with a daughter that takes the life of another sibling.
Tyaisa Jackson confessed to stabbing her two year old sister and will now be charged as an adult!
According to other children that were in the house at the time, Tyaisa was…