kindred vs sibling

kindred

noun
  • Distant and close relatives, collectively; kin. 

  • A grouping of relatives. 

  • A household or group following the modern pagan faith of Heathenry or Ásatrú. 

  • Affinity, likeness. 

  • Blood relationship. 

  • People of the same ethnic descent, not including speaker; brethren. 

  • One who is kindred, literally or figuratively; a kin, kinsman. 

adj
  • Connected, related, cognate, akin. 

  • Of the same nature, or of similar character. 

sibling

noun
  • A person who shares a parent; one's brother or sister who one shares a parent with. 

  • A node in a data structure that shares its parent with another node. 

  • The most closely related species, or one of several most closely related species when none can be determined to be more closely related. 

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