folks vs relation(s)

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. 

relation(s)

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