They're MAdrigals because their parents were.
they are only in madrigal
No, unless they aren't actually siblings.
Based in book 10(Into the gauntlet) all of the branches meet to get the last clues which is Gideons serum but Isabelle Kabra appeared and try to kill all of them but Amy and Dan defeated her so when all branches (the Ekaterina,Lucian,Thomas,Janus) trusted them and they gave all their clues to Dan and Amy....so Amy and Dan won....
Amy and Dan are part of the Cahill family, a secret society in The 39 Clues series. They belong to the Madrigal branch of the Cahill family, one of the most secretive and enigmatic branches.
Amy and Dan are siblings. Amy loves Dan as a sibling and a brother.
Amy and Dan are Madrigals. The Madrigals decended from Madeline Cahill. Olivia Cahill (the original cahill) was pregnant with her when Olivia died. Madeline then decided to carry out her mother's wishes. Madrigals try to keep the other branches from finding all the 39 clues. Hope this helps! :)
Well, the Madrigals aren't exactly bad. The other branches are fighting for all the clues, and the Madrigals are protecting it. The branches don't exactly realize that, they have no idea that Amy & Dan are Madrigals, so they thought that they must be Janus, Ekat, Tomas, or Lucian. And to them the Madrigals are bad, but in the big pic, nope not rlly
Amy and Dan are Madrigals and are decended from MadelineCahill.
i believe Amy and Dan are Madrigals.
Amy and Dan are Madrigals.
Amy and dan are madrigals, the man in black is their great-uncle, fiske cahill, Nallie is a madrigal too, and Fiske and nellie are the new legal guardians of Amy and dan.
In the book THE VIPER'S NEST it reveals the Dan and Amy are Madrigals.