Explanation of the Charts by Court Assessor Hans Joachim Lemme
The law makes a distinction among Jews, Mixed and German blooded people. The ethnic background of the grandparents determines to which group an individual belongs.
Those with 3 or 4 full-blooded Jewish grandparents are considered Jews.
Those with 1 or 2 full-blooded Jewish grandparents are considered Mixed. Within this group, a person with two Jewish grandparents is considered Mixed, 1st Degree and someone with one Jewish grandparent is Mixed 2nd Degree.
German-blooded people are only those who have no Jewish grandparents among the four grandparents.
Whether or not an individual is considered Jewish is determined not by one's religious belief but by one's ethnic origin in accordance with nature. Therefore it is possible for a grandparent to be a Jew even if he professes to be a Christian or belongs to no religion at all. If a grandparent is a member of the Jewish religion, then he is regarded in any case as a full-blooded Jew. This is justified by the fact that during the present time grandparents haved been leaving the Jewish religion but no one has been leaving other religions to join the Jewish religion. The Jewish religious community always consisted of only those who were full-blooded and ethnic Jews.
The conditions for determining who is regarded as German-blooded are already known through the declarations made by the Reichs Minister for Internal Affairs. They are those who belong to one of the races which originated from among the European peoples or are Mixed with blood from these races.
Now the different marriage possibilities will be presented individually. It must be noted that only those conditions are mentioned which were established after the "Blood Law". These do not take into consideration the "Marriage Health Law". For every intended marriage, the partners must also prove in particular that there are no health deficiencies as deemed by the "Marriage Health Law".
--Excerpt from "Organization Book of the NSDAP", 1943, pg. 577.