[B34VER]

https://tvtropes.org/pmwiki/pmwiki.p...illbillyIncest

One common incest association links it to poor, rural, unsophisticated people. There are a couple different angles to come at it from:

Acceptable Targets: Wealthier urban people like to feel superior by telling narratives about how poor rural people are Half Witted Hillbillies: stupid, backwards, and worthy of ridicule.
Logistics: In small communities, everyone is likely to be related. If the community is isolated and people neither move in nor out, where else are you going to find a partner?
Lawlessness: In places outside the reach of a strong central government, you can get away with bucking the rules. Who's going to enforce them?
This trope can be set either Down on the Farm or in the Wild Wilderness. It goes hand-in-hand with Hillbilly Horrors. There's a high level of co-occurrence with Bandit Clan and Cannibal Clan.

Hillbilly incest is usually Played for Laughs or Played for Horror. Either way, it skews heavily toward short gags. Very rarely is it a topic explored in depth or given much time. It's very derogatory, pulling in tropes like Inbred and Evil and Villainous Incest. It often dips into Black Comedy Rape. It's virtually never the Forbidden Love that can be found in upper-class incest.

While the two are framed very differently, there's some surprising parallelism to its Opposite Trope, Royal Inbreeding. Incest is associated with the extreme upper and lower classes, and almost never with the middle class.

In the US, hillbilly incest is associated with the Deep South and Appalachia. In the UK, it's associated with Norfolk and the West Country. In Australia, it's associated with Tasmania.

While there have been recorded instances in real life, No Real Life Examples, Please!