the incest is to refine the code. A child sired on a daughter is 50% father, a child sired on the granddaughter is 75% father genes. Ad infinitum.
Robert Wood Johnson, the satanic patriarch ho founded Johnson and Johnson, made it to 3 - 75% and was planning to continue when he croaked.
In thoroughbred breeding the practice is called "Taking a nick back" or just "taking a nick" and the purpose is to strengthen supposed traits of an ancestor in the bloodline. More often it produces deleterious effects and breeder tend not to talk about it, even if they do it.
The cultist are likely trying to enhance the supposed Nephilim bloodlines, the angelic or fallen angelic blood.
hy the blood such a big deal to the cultists?
For that search for Rupert Steiner's book, "The Occult Significance of Blood. Sometimes also called BloodIs a very special fluid
A similarly titled video imbedded.
There are also rituals preformed around the time of conception intended to do this and that