family unit vs humanity

family unit

noun
  • A unit of people consisting of family members, distant or immediate. 

humanity

noun
  • Humankind; human beings as a group. 

  • Any academic subject belonging to the humanities. 

  • The human condition or nature. 

  • The quality of being benevolent; humane traits of character; humane qualities or aspects. 

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