co-grandmother

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Noun

co-grandmother (plural co-grandmothers)

1. the mother of one's son- or daughter-in-law, as common grandmother of their children; the relationship between women who have grandchildren in common; maternal grandmother vis-à-vis paternal grandmother.

Synonyms

• co-mother-in-law (relative to the children rather than the grandchildren)

Related terms

• co-grandmother-in-law
• co-in-law
• co-aunt

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