drawing room vs family room

drawing room

noun
  • A multifunctional room that can be used for any purpose in a palace or castle. 

  • A private room on a railroad sleeping car. 

  • A levée where ladies are presented at court or to society. 

  • A room where engineers draw up plans and patterns. 

family room

noun
  • A comfortable room in a dwelling, for frequent leisure use. 

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