Mischling
Mischling ("mixed-blood" in German, plural: Mischlinge) was the German term used during the Third Reich to denote persons deemed to have both Aryan and Jewish ancestry. The word has essentially the same origin as the 17th-century and now obsolete English term mestee, mestizo in Spanish and métis in French. In German, the word has the general denotation of hybrid, mongrel, or half-breed.
Nuremberg laws
As defined by the Nuremberg laws in 1935, a Jew (German: Volljude in Nazi terminology) was a person – regardless of religious affiliation or self-identification – who had at least three grandparents who had been enrolled with a Jewish congregation. A person with two Jewish grandparents was also legally "Jewish" (so-called Geltungsjude, roughly speaking, in English: "Jew by legal validity") if that person met any of these conditions:
Was enrolled as member of a Jewish congregation when the Nuremberg Laws were issued, or joined later
Was married to a Jew.
Was the offspring from a marriage with a Jew, which was concluded after the ban on mixed marriages.