Definition from Wiktionary, the free dictionary
co-parents-in-law pl (plural only)
- The parents of one's son- or daughter-in-law, that is, the parents-in-law of one's son or daughter.
- The relationship between people whose children marry each other: the parents of the bride vis-à-vis the parents of the groom. Includes the relationship between maternal and paternal grandparents.
1995, Janet Carsten, Stephen Hugh-Jones, About the house: Lévi-Strauss and beyond, page 120, 132:
- the relation between co-parents-in-law focuses on the production of grandchildren […] the relation between co-parents-in-law as stabilized through shared grandchildren
- Rare in conversation, the generic "in-laws" is generally used, with context left to disambiguate. Once grandchildren are born, the term co-grandparents may be used if the focus is on the relationship through the grandchildren rather than though the married couple.
- co-parents (divorced or separated)
the parents of one's son- or daughter-in-law
the relationship between people whose children marry each other
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