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Use "great-great-grandson" in a sentence
"Survivors include 10 grandchildren; 21 great-grandchildren; and a great-great-grandson."
"What else would you expect from the great-great-grandson of Albert Einstein?"
"Matthew Chapman is the great-great-grandson of Charles Darwin, author of two books, and writer and director of the new film 'The Ledge' starring Liv Tyler, Charlie Hunnam, Terrence Howard, and Patrick Wilson."