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Riddles' grandma

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Yadina Riddle mentions "our grandma is coming to visit" to Brad Scott at the start of I Am Catherine the Great, also meaning the grandma of Xavier Riddle.

It's unclear whether that would be the Riddles' dad's mom or the Riddles' mom's mom

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Berby • Brad Meltzer (character) • Dr. Zoom • Xavier Riddle • Yadina Riddle
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Abraham Lincoln • Harriet Tubman

Minor Characters
Little Girl • Butterfly Club Leader • Older Girl • Fearless Jean • Murray • Anne Sullivan • Belle • Helen's special teacher • Π • Poppy • Bell's Mother • Helen's escort • George (I Am Alexander Graham Bell) • Next Door Neighbor • Flo's pet • Flo's neighbor's dog • Basketballer • Robotter • Mona • Amelia's mom • Amelia's teacher • Golda's Mom • Trike Kid • Turtle • Park Ranger • Regina • Jin • Charlie • Benjamin and Theodore • Phillip • King Ptolemy • Cleo's cat • Riddles' mom • Riddles' dad • Riddles' grandma • Matthias • Brad's dad • Brad's granddad • Brad's great-granddad • Riddles' mom's mom • Tomioka's Father • Yadina's great grandma • Lawrence • Daniel Read Anthony • Guelma Penn Anthony • Gertie • Young Man • Old Man • Julia's Grandmother • Mallie Robinson • Sarah • Brian • Kid in a green coat • Sarah's dad • Brendan Connolly • Girl (I Am Marie Owens) • Tyler • Boy 1 • Lion • Queen of Clubs • John Adams • Anna's teacher • Jack Pavlova • Xavier and Yadina's great great grandmother
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