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Definition of Co-parents-in-law
1. Noun. The parents of one's son- or daughter-in-law, that is, the parents-in-law of one's son or daughter. ¹
2. Noun. 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. ¹
¹ Source: wiktionary.com