co-parent-in-law vs kin

co-parent-in-law

noun
  • A parent of one's son- or daughter-in-law, that is, a parent-in-law of one's son or daughter. 

kin

noun
  • One or more relatives, such as siblings or cousins, taken collectively. 

  • Relationship; same-bloodedness or affinity; near connection or alliance, as of those having common descent. 

  • Race; family; breed; kind. 

  • Persons of the same race or family; kindred. 

  • A fictional character who one deeply relates to. 

  • Someone who relates deeply to a certain fictional character. 

adj
  • Related by blood or marriage, akin. Generally used in "kin to". 

verb
  • To identify with; as in empathize or emotionally relate to a fictional character. 

How often have the words co-parent-in-law and kin occurred in a corpus of books? (source: Google Ngram Viewer )