Xavier Riddle and the Secret Museum Wiki
Xavier Riddle and the Secret Museum Wiki

Great-Great Grandma Riddle (voiced by Teresa Pavlinek) appears in Xavier Riddle and the Secret Movie: I Am Madam President.

She is the one of the great-great grandmothers of Xavier and Yadina.

She co-founded the Museum atop The Secret Museum, and can appear as a hologram projected by Berby despite having passed away.

She shares many similarities to her great-great granddaughter, Yadina Riddle; both wear pink, both make jokes, both like cheese and grape jelly sandwiches, and both like turtles.


It is never clarified whether she is their ancestor on the maternal or paternal side of the family. However since she bore the surname "Riddle" this indicates it would be whichever side of the family (mother or father) the surname originated. That is traditionally the father's side (with wives taking husband's surname) but this is not always practised in modern marriages, and it is never clarified on the show.

Yadina's great grandma could possible be her daughter.


new painting that appears in movie

Yadina pointing out her grandparents


the original painting that used to be there

Great-Great Grandpa Riddle is the logical name for the man shown beside her in the painting, since they are referred to as "our great-great grandparents". Xavier says they built the ENTIRE museum, which is probably the sole other party who the Tour Guide implies when describing GGGM Riddle as "one of the founders". If the two built the entire thing by themselves, there would be no additional parties. Xavier of course could be simplifying things as they might've just been in charge of construction and had assistance from builders.


ved Characters
BerbyBrad Meltzer (character)Dr. ZoomXavier RiddleYadina Riddle
Historical Figures
Johann Sebastian BachMarie CurieMary ShelleyHarry HoudiniHelen KellerAlexander Graham BellFlorence NightingaleGeorge Washington CarverLeonardo da VinciAmelia EarhartIsaac NewtonGolda MeirWinston ChurchillCleopatraCatherine the GreatTomioka TessaiGeorge WashingtonSusan B. AnthonyZora Neale HurstonCharles DickensWright BrothersBronte SistersMark TwainAbigail AdamsJulia ChildNeil ArmstrongJackie RobinsonAnna PavlovaMary LeakeyAlexander HamiltonTheodore RooseveltEleanor RooseveltLou GehrigMarie OwensJackie Joyner-KerseeSally RideJunko TabeiNikola TeslaNellie BlyMaya AngelouFrederick DouglassLouis PasteurRachel CarsonKate WarneSir Arthur Conan DoyleCesar ChavezDolores HuertaConfuciusSacagaweaMary AnningCharlie ChaplinBillie Jean KingArthur AsheRosa ParksThurgood MarshallHarriet TubmanWilma RudolphJonas SalkJesse OwensElla FitzgeraldJames NaismithTemple GrandinAlbert EinsteinCarol BurnettAbraham LincolnJane JacobsEdmund HillaryCelia Cruz

Rukmini DeviBob RossIbn BattutaBeulah Louise HenryJigonsasehFred Rogers

Minor Characters
HarperButterfly Club LeaderOlder GirlFearless JeanMurrayAnne SullivanBelleHelen's special teacherΠPoppyBell's MotherHelen's escortGeorge (I Am Alexander Graham Bell)Next Door NeighborFlo's petFlo's neighbor's dogBasketballerRobotterMonaAmelia's momAmelia's teacherGolda's MomTrike KidTurtlePark RangerReginaJinCharlieBenjamin and TheodorePhillipKing PtolemyCleo's catRiddles' momRiddles' dadRiddles' grandmaMatthiasBrad's dadBrad's granddadBrad's great-granddadRiddles' mom's momTomioka's FatherYadina's great grandmaLawrenceDaniel Read AnthonyGuelma Penn AnthonyGertieYoung ManOld ManJulia's GrandmotherMallie RobinsonSarahBrianKid in a green coatSarah's dadBrendan ConnollyGirl (I Am Marie Owens)TylerBoy 1LionQueen of ClubsJohn AdamsAnna's teacherJack PavlovaXavier and Yadina's great great grandmotherDjuka TeslaMacakAlbertJules VerneJimmyTommyEggertonLennyBig KidBand LeaderMaiLewis and ClarkJosephHannah ChaplinBobby RiggsJamieTennis BoyTennis OfficialSkater BoyBus DriverGentlemanPoppy the DogKitty the CatFredThurgood's momBen and Rit TubmanSlave Owner (I Am Harriet Tubman)Wilma's sistersRufusRunners on SidelinesBenJosiah CrawfordTenzing Norgay