So fun fact, Alabama doesn't even enter into the top 20 states for incest and inbreeding, falling well below Washington state, Maine, West Virginia and Origen and with Kentucky being the state with the highest counts of incest and inbreeding in the US and its not legal it is in fact a felony in Alabama. There are 3 states were it is legal those are New Jersey and Rhode Island were it requires both parties to be consenting adults and not married, and Ohio which also requires all parties to be consenting adults and for none of the parties to be a parental figure to the other. The Censes Bureau gives one access to data some would consider....unnatural.
Edit: I should not say "Legal", I should say "Not a criminal offense".