grandchild vs son

grandchild

noun
  • A child of someone's child. 

son

noun
  • A male descendant. 

  • The current version of a file, derived from the preceding father file. 

  • A male adopted person in relation to his adoptive parents. 

  • An informal address to a friend or person of equal authority. 

  • One's male offspring. 

  • A familiar address to a male person from an older or otherwise more authoritative person. 

  • A male person who has such a close relationship with an older or otherwise more authoritative person that he can be regarded as a son of the other person. 

  • A male person considered to have been significantly shaped by some external influence. 

  • Son cubano, a genre of music and dance blending Spanish and African elements that originated in Cuba during the late 19th century. 

verb
  • To address (someone) as "son". 

  • To produce (i.e. bear, father, beget) a son. 

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