folks vs member of someone's family

folks

noun
  • People in general; everybody or anybody. 

  • The members of one's immediate family, especially one's parents 

  • The police. 

  • Late 19th and early 20th century migrants to California from Iowa and other parts of the Midwestern United States. 

member of someone's family

How often have the words folks and member of someone's family occurred in a corpus of books? (source: Google Ngram Viewer )