Just as a serial killer will terrorize their victims in a horror movie, siblings tend to terrorize one another, especially while growing up. These relationships can be tumultuous at times, but the bonds that siblings share can also be essential when developing socially and emotionally. Whether these relationships develop into being best friends or becoming a sibling rivalry, it would be difficult to find another person who knows all of one's ins and outs and is still willing to stick it out through thick and thin, and some of these best sibling duos in horror prove just that.
Source：https://www.cbr.com/best-sibling-duos-horror-movies/
