family history vs parentage

family history

noun
  • An extension to genealogy in which the life and times of the people concerned are investigated. 

  • Information concerning the disorders suffered by the direct relatives of a patient; especially useful if the disorders are genetic. 

parentage

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

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

  • Origin; derivation. 

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