The story
From co- + parent-in-law or co-parent + -in-law.
Etymology from Wiktionary, CC BY-SA 4.0.
co-parent-in-law
Today it means: A parent of one's son- or daughter-in-law, that is, a parent-in-law of one's son or daughter. Full definition →
Today it means: A parent of one's son- or daughter-in-law, that is, a parent-in-law of one's son or daughter. Full definition →
From co- + parent-in-law or co-parent + -in-law.
Etymology from Wiktionary, CC BY-SA 4.0.