This has to do with breeding and is as old as mankind. Plato's republic:
The method whereby this selective breeding will be conducted, Socrates explains, is that at designated calendar times and at the most appropriate periods of their sexual activity and fertility, the men and women of this class will be brought together in “marriage festivals,” but they will not be permitted the free choice of sexual partners. Rather, they will be “taught” that the older rulers have drawn all pairs of sexual partners by blind lot, whereas in fact the rulers will have paired the sexual partners by careful selection so as to ensure the success of the eugenic method the rulers have adopted.
As for the children so produced, they will have to be raised communally and provided for by citizens designated as nurses. Furthermore, the children are not to be permitted to recognize their birth parents; the children are not to be permitted to develop “old time” family loyalties; in fact, the birth mothers may be at times prohibited from nursing their children, who will be provided with wet-nurses for their needs.
This plan was implemented to a tee. SS officers were bred with select "ladies" and their children were raised in communes
"Those who are physically and mentally unhealthy and unfit must not perpetuate their own suffering in the bodies of their children. From the educational point of view there is here a huge task for the People's State to accomplish. But in a future era this work will appear greater and more significant than the victorious wars of our present bourgeois epoch. Through educational means the State must teach individuals that illness is not a disgrace but an unfortunate accident which has to be pitied, yet that it is a crime and a disgrace to make this affliction all the worse by passing on disease and defects to innocent creatures out of mere egotism." - Adolf Hitler, Mein Kampf