In any family of three or more, shifting alliances exist. Two siblings might team up against a parent, only to turn on each other when a hidden inheritance is revealed. These dynamics should shift based on the stakes of the scene. The Enduring Power of the Domestic Sphere
It's possible the user has a misspelling or misremembering. Maybe they meant "roadkill incest" as a shock site or a creepypasta. I recall a creepypasta about "roadkill incest" or something similar. Let's search for "roadkill incest creepypasta". search for a creepypasta didn't find the term. roadkill incest
While homozygosity can reinforce desirable traits in controlled domestic breeding, in the wild, it frequently unmasks deleterious recessive mutations. In a healthy, diverse population, a harmful recessive gene inherited from one parent is usually masked by a dominant, functional gene from the other. In an isolated, inbred population, both parents are likely to carry the same recessive defect. In any family of three or more, shifting alliances exist