genitor vs parentage

genitor

noun
  • a generator; an originator 

  • a biological parent (either male or female), or the direct cause of an offspring. 

parentage

noun
  • Origin; derivation. 

  • The social quality of one's class in society. 

  • The identity and nature of one's parents, and in particular, the legitimacy of one's birth. 

How often have the words genitor and parentage occurred in a corpus of books? (source: Google Ngram Viewer )