brother vs grandfather

brother

noun
  • Son of the same parents as another person. 

  • A form of address to a man. 

  • Someone who is a peer, whether male or female. 

  • A male fellow member of a religious community, church, trades union etc. 

  • A male having at least one parent in common with another (see half-brother, stepbrother). 

  • Somebody, usually male, connected by a common cause, situation, or affection. 

  • A black male. 

  • Someone who is a kinsman or shares the same patriarch. 

intj
  • Expressing exasperation. 

verb
  • To treat as a brother. 

grandfather

noun
  • A father of someone's parent. 

  • A male forefather. 

  • The archived older version of a file that immediately preceded the father file. 

verb
  • To retain discontinued laws or rules for (a thing, person or organization previously affected by them). 

  • To be, or act as, a grandfather to. 

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