Blacks comprise about 12 % of our population, in smaller cities and communities where there is a 70 % out of wedlock rate for childbirth and "baby mommas" have multiple unknown fathers procreating their child, in second and third generations it will be very easy to see half sister and half brothers procreating since parentage is unknown.
I know, don't tell me, I'm a racist for even thinking it
Intergenerational incest has been accepted in segments of the black community for decades. It’s well known. Ask any urban cop or social worker if you don’t believe it.