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Use "grandmamma" in a sentence
""Thank you, ma'am, I shall be very happy, if grandmamma is willing.""
"Mrs. Newcome can scarcely be called his grandmamma, I suppose; and I daresay her"
"Such a silly, inexperienced creature must have time given her to learn to be reasonable, beside, she (Frau Brohl) would take care of everything, and Herr Haber could call her grandmamma now if he liked."