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Guillermo and Isabella Márquez are the brothers and sisters of Dora from the series Dora the Explorer. They are a 1 year old baby. They appeared in many episodes of Dora the Explorer starting with "Big Sister Dora". There were remained unnamed until the episode "Dora's Jack-in-the-Box", where his and her names was revealed. They appeared in the Dora and Friends episode "Magic Land", in which he appears a little older and can speak in full sentences. They also helped Dora in "Super Babies".

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