We have all known a pair of sisters that are attached at the hip, but Christine and Lea Papin take this to a new level. After a traumatic childhood, the two form a special and incestuous bond. The Papin sisters felt like it was the two of them against the world. One evening the two snap and mercilessly murder two of the family members they were employed by. Sources:

• https://allthatsinteresting.com/papin-sisters
• https://anymystery.com/papin-sisters-christine-and-lea-papin/
• https://thecrimewire.com/multifarious/The-Crime-of-the-Papin-Sisters- ...