When a redneck dad has hot steamy incessed sex with his daughter, has a baby with her, then when her daughter's cherry ripens he has incessed sex with her, impregnating her. repeat process untill the gene pool is so shallow that the only possible product of a nother steamy sex session with great granddaughter #13 is a clone of himself.
Crawdad says Hay-dee: "Jenna git o'er here and sit on poppas lap ima gonna git you pregger and then fuck my granddaughters till i die"
Jenna: "not again paw paw! the last monster you created with our incest redneck cloning came out with a tail and fangs and et officer jimbo"