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co-grandfather (plural co-grandfathers)

  1. the father of one's son- or daughter-in-law, as common grandfather of their children; the relationship between men who have grandchildren in common; maternal grandfather vis-à-vis paternal grandfather.
    • 1946 September 9, “The Milkman”, in Time[1]:
      The milkman was Edward Kenelm Digby, 52, eleventh Baron Digby, World War I colonel in the Coldstream Guards, World War II inspector of infantry-training establishments, co-grandfather (with Winston Churchill) of Randolph Churchill's small son, Winston Churchill II.


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