little sister vs out of order

little sister

noun
  • Synonym of younger sister 

out of order

prep
  • Inappropriate or unsuitable. 

  • Not functioning properly. 

  • Not in order: not according with with the procedural rules governing formal meetings of a deliberative body. 

  • Out of normal sequence. 

adj
  • broken, not working right 

How often have the words little sister and out of order occurred in a corpus of books? (source: Google Ngram Viewer )