peon vs poor relation

peon

noun
  • A person of low rank or importance. 

  • A messenger, foot soldier, or native policeman. 

  • A lowly person; a peasant or serf; a labourer who is obliged to do menial work. 

poor relation

noun
  • Something seen as inferior. 

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