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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

Historical Figures

Johann Sebastian Bach • Marie Curie • Mary Shelley • Harry Houdini • Helen Keller • Alexander Graham Bell • Florence Nightingale • George Washington Carver • Leonardo da Vinci • Amelia Earhart • Isaac Newton • Golda Meir • Winston Churchill • Cleopatra • Catherine the Great • Tomioka Tessai • George Washington • Susan B. Anthony • Zora Neale Hurston • Charles Dickens • Wright Brothers • Bronte Sisters • Mark Twain • Abigail Adams • Julia Child • Neil Armstrong • Jackie Robinson • Anna Pavlova • Mary Leakey • Alexander Hamilton • Theodore Roosevelt • Eleanor Roosevelt • Lou Gehrig • Marie Owens • Jackie Joyner-Kersee • Sally Ride • Junko Tabei • Nikola Tesla • Nellie Bly • Maya Angelou • Frederick Douglass • Louis Pasteur • Rachel Carson • Kate Warne • Sir Arthur Conan Doyle • Cesar Chavez • Dolores Huerta • Confucius • Sacagawea • Mary Anning • Charlie Chaplin • Billie Jean King • Arthur Ashe • Rosa Parks • Thurgood Marshall • Harriet Tubman • Wilma Rudolph • Jonas Salk • Jesse Owens • Ella Fitzgerald • James Naismith • Temple Grandin • Albert Einstein • Carol Burnett • Abraham Lincoln • Jane Jacobs • Edmund Hillary • Celia Cruz

Rukmini Devi • Bob Ross • Ibn Battuta • Beulah Louise Henry • Jigonsaseh • Fred Rogers

Minor Characters

Harper • 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 • Djuka Tesla • Macak • Albert • Jules Verne • Jimmy • Tommy • Eggerton • Lenny • Big Kid • Band Leader • Mai • Lewis and Clark • Joseph • Hannah Chaplin • Bobby Riggs • Jamie • Tennis Boy • Tennis Official • Skater Boy • Bus Driver • Gentleman • Poppy the Dog • Kitty the Cat • Fred • Thurgood's mom • Ben and Rit Tubman • Slave Owner (I Am Harriet Tubman) • Wilma's sisters • Rufus • Runners on Sidelines • Ben • Josiah Crawford • Tenzing Norgay

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