member vs sibling

member

noun
  • A function or piece of data associated with each separate instance of a class. 

  • A file stored within an archive file. 

  • the judge or adjudicator in a consumer court. 

  • The penis. 

  • A part of a whole. 

  • Part of an animal capable of performing a distinct office; an organ; a limb. 

  • One who officially belongs to a group. 

  • An element of a set. 

  • Either of the two parts of an algebraic equation, connected by the equality sign. 

  • A part of a discourse or of a period, sentence, or verse; a clause. 

  • One of the propositions making up a syllogism. 

  • friend 

sibling

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

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

  • 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 member and sibling occurred in a corpus of books? (source: Google Ngram Viewer )