Hope Cahill and Arthur Trent
Amy and Dan are siblings. Amy loves Dan as a sibling and a brother.
Dan and Amy Cahill
In Book Seven: The Viper's Nest: Amy and Dan Cahill figure out they are Madrigals
Yes, as indicated by their last names, they are related, and this relation is that of being siblings.
Because they were close to the 39 clues and were madrigals Amy and Dan Cahill's Father was a VESPER... The Vespers set the fire and their father escaped
i believe 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.
Ashley Jackson will play Amy Cahill. Adam Hicks will play Dan Cahill.
The older sister of Dan Cahill.
Ashley Jackson plays Amy Cahill. Adam Hicks plays Dan Cahill.
Madrigals