incestral

adj

1. (nonstandard)Incestual.

   “... incestral families? First of all, have some of your experiences or training been involved in assessing the incestral family relationship? Yes, that has. Do we know or do you have an opinion about whether or not there are any common[…]”

   “A little history of how Moab came to be. Moab was the direct result of an "incestral" relationship where Abraham's nephew Lot was lured by his daughters, as he got too drunk to recognize himself, by one of his own daughters; and why God could not accept Moab for one.”