Evil Kin - Season 1 - Eps 1: Thicker Than Blood
Kenneth and Kari Allen appeared to be loving siblings until their parents tore them apart. When they reunite years later, they embark on a rampage of murder and incest.
About Evil Kin

Title: Evil Kin
First Air Date: 2013-08-28
Last Air Date: 2016-12-29
Status: Ended
Rating: 5/10 (from 3 votes)
Language: EN
Seasons: 4
Total Episodes: 35
Network: Investigation Discovery
Genres: Documentary, Crime
Production Companies: Sirens Media
Synopsis
It's amazing the things that you can inherit from your family gene pool: blue eyes, a beautiful smile, a winning personality. But what about your family's less desirable traits? A grandfather's talent for swindling, an aunt's knack for aggravated assault or even a father's flair for murder.... can you actually inherit evil from your family tree? Evil Kin begs this question as well as whether psychopathic behavior is pre-programmed. From siblings who conspire to kill their parents, to three brothers who grow up independently to become a serial killer, a rapist and a mercenary, Evil Kin follows true-crime mysteries surrounding bone-chilling cases that prove blood is always thicker than water.