fathership vs genealogy

fathership

noun
  • The state of being a father; fatherhood; paternity. 

  • A title of respect addressed to a priest. 

genealogy

noun
  • The descent of a person, family, or group from an ancestor or ancestors; lineage or pedigree. 

  • The study, and formal recording of such descents. 

  • A record or table of such descent; a family tree. 

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