family unit vs ménage

family unit

noun
  • A unit of people consisting of family members, distant or immediate. 

ménage

noun
  • A household; a domestic situation. 

  • A type of cooperative society whereby all members pay a regular sum of savings, or through which goods can be paid for in installments. 

  • A group of people living together in a sexual relationship. 

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