Well, their grandma, Grace Cahill, was an Ekaterina Leader. If they're her grandchildren, they have to be Ekaterina too. Dan can't be a Tomas because Ekaterina is in his blood, along with Amy.
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Tomas and Ekaterina are two different family branches within the Cahill family in "The 39 Clues" book series. Dan and Amy are siblings who belong to the Ekaterina branch, so they cannot be members of the Tomas branch. Each branch has its own distinct characteristics and history.