causation vs parentage

causation

noun
  • The act of causing. 

  • The act or agency by which an effect is produced. 

  • Cause and effect, considered as a system. 

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 causation and parentage occurred in a corpus of books? (source: Google Ngram Viewer )