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Use "maternal grandmother" in a sentence
"Fortunately, her maternal grandmother left her some money, so she was able to have orthodontal work and esthetic surgery."
"He would be called “Billy” because his maternal grandmother used to pick him up and say “Bellissimo,” and a shortened version stuck."
"Amanda had made a transatlantic crossing when she was just Alexandras age, and my paternal grandparents and maternal grandmother had come to America by ship, so there was what might be called a family tradition of a little time at sea."