"You never do anything!" -Amanda talking to her brothers[src]
"And that girl looks like Aunt Isabella..." -Amanda[src]
Amanda is Candace's future daughter who appears in the episode "Phineas and Ferb's Quantum Boogaloo". She appears to act like her mother, but reversed, she always told Xavier and Fred to do something cool on their summer vacation rather than just sit under front of the family's digital tree. To her annoyance, they still answer her question "What are you doing?" with "Nothing" even when they are building bumper cars that move in five dimensions. She always responds, "I knew it! You guys never do anything!"
She looks almost exactly like her mother when she was Amanda's age, except for different clothes and hairstyle. (Although her skirt is pretty much the same.) She also shares the same purpose: to bust her brothers, except Amanda tries to bust Xavier and Fred for doing nothing, while Candace tries to bust Phineas and Ferb for doing Big Ideas. Also, in the end of the episode, Phineas and Ferb's Quantum Boogaloo, Isabella figures out that she is going to be Amanda's aunt, which in obvious reasons means she is going to marry either Phineas or Ferb.
"Amanda" and "Xavier" are the two names that Candace had picked out for her future children. Given her interest in Jeremy, it's probable that he is the father of both children. However, this is not definite.
It is possible that Jeremy might be her father because her brother, Xavier, has the same blonde hair and light blue eyes as Jeremy.
She is the first Phineas and Ferb character to be voiced by a Wizards of Waverly Place actor (Jennifer Stone).
If Jeremy Johnson is her father, Suzy Johnson would be her aunt too.
Candace's plan with Jeremy was that they would date through college and then marry and have children. If Amanda is approximately the same as Candace in the present day and Jeremy is Amanda's father, then her dream has come true.
